# Encyclopedia

(Redirected to Half-life (disambiguation) article)

Half-life is a mathematical and scientific description of exponential or gradual decay.
Half-life may also refer to:
In science:
• Biological half-life, pertaining to organisms (also refers to "elimination half-life", a pharmacokinetic parameter in medicine)
• Effective half-life, the effective radioactive half-life in organisms after accounting for excretion.
In video games:
• Half-Life (series), a video game series by Valve
• Half-Life (video game), a 1998 game and the first title in the series
• Half-Life: Opposing Force, Blue Shift, and Decay, expansion packs for the first title.
• Half-Life 2, the 2004 sequel to the first game
• Half-Life 2: Episodes One, Two, and Three, a trilogy of episodic games serving as a sequel to Half-Life 2
In literature:
In music:
In film:
• Half Life: A Parable for the Nuclear Age, a 1985 Australian documentary film
• Half-Life (film), a 2008 independent film by Jennifer Phang.

Number of
half-lives
elapsed
Fraction
remaining
Percentage
remaining
0 1/1 100
1 1/2 50
2 1/4 25
3 1/8 12.5
4 1/16 6.25
5 1/32 3.125
6 1/64 1.563
7 1/128 0.781
... ... ...
n 1/2n 100(1/2n)

The half-life of a quantity whose value decreases with time is the interval required for the quantity to decay to half of its initial value. The concept originated in describing how long it takes atoms to undergo radioactive decay but also applies in a wide variety of other situations.

The term "half-life" dates to 1907. The original term was "half-life period", but that was shortened to "half-life" starting in the early 1950s.[1]

Half-lives are very often used to describe quantities undergoing exponential decay—for example radioactive decay—where the half-life is constant over the whole life of the decay, and is a characteristic unit (a natural unit of scale) for the exponential decay equation. However, a half-life can also be defined for non-exponential decay processes, although in these cases the half-life varies throughout the decay process. For a general introduction and description of exponential decay, see the article exponential decay. For a general introduction and description of non-exponential decay, see the article rate law.

The converse for exponential growth is the doubling time.

The table at right shows the reduction of the quantity in terms of the number of half-lives elapsed.

## Probabilistic nature of half-life

A half-life often describes the decay of discrete entities, such as radioactive atoms. In that case, it does not work to use the definition "half-life is the time required for exactly half of the entities to decay". For example, if there is just one radioactive atom with a half-life of 1 second, there will not be "half of an atom" left after 1 second. There will be either zero atoms left or one atom left, depending on whether or not the atom happens to decay.

Instead, the half-life is defined in terms of probability. It is the time when the expected value of the number of entities that have decayed is equal to half the original number. For example, one can start with a single radioactive atom, wait its half-life, and measure whether or not it decays in that period of time. Perhaps it will and perhaps it will not. But if this experiment is repeated again and again, it will be seen that it decays within the half life 50% of the time.

In some experiments (such as the synthesis of a superheavy element), there is in fact only one radioactive atom produced at a time, with its lifetime individually measured. In this case, statistical analysis is required to infer the half-life. In other cases, a very large number of identical radioactive atoms decay in the time-range measured. In this case, the central limit theorem ensures that the number of atoms that actually decay is essentially equal to the number of atoms that are expected to decay. In other words, with a large enough number of decaying atoms, the probabilistic aspects of the process can be ignored.

There are various simple exercises that demonstrate probabilistic decay, for example involving flipping coins or running a computer program. See the following websites: [1], [2], [3].

## Formulas for half-life in exponential decay

An exponential decay process can be described by any of the following three equivalent formulae:

$N_t = N_0 \left\left(\frac \left\{1\right\}\left\{2\right\}\right\right)^\left\{t/t_\left\{1/2\right\}\right\}$
$N_t = N_0 e^\left\{-t/\tau\right\}$
$N_t = N_0 e^\left\{-\lambda t\right\}$

where

• $N_0$ is the initial quantity of the thing that will decay (this quantity may be measured in grams, moles, number of atoms, etc.),
• $N_t$ is the quantity that still remains and has not yet decayed after a time t,
• $t_\left\{1/2\right\}$ is the half-life of the decaying quantity,
• $\tau$ is a positive number called the mean lifetime of the decaying quantity,
• λ is a positive number called the decay constant of the decaying quantity.

The three parameters $t_\left\{1/2\right\}$, $\tau$, and λ are all directly related in the following way:

$t_\left\{1/2\right\} = \frac\left\{\ln \left(2\right)\right\}\left\{\lambda\right\} = \tau \ln\left(2\right)$

where ln(2) is the natural logarithm of 2 (approximately 0.693).

By plugging in and manipulating these relationships, we get all of the following equivalent descriptions of exponential decay, in terms of the half-life:

$N_t = N_0 \left\left(\frac \left\{1\right\}\left\{2\right\}\right\right)^\left\{t/t_\left\{1/2\right\}\right\} = N_0 2^\left\{-t/t_\left\{1/2\right\}\right\} = N_0 e^\left\{-t\ln\left(2\right)/t_\left\{1/2\right\}\right\}$
$t_\left\{1/2\right\} = t/\log_2\left(N_0/N_t\right) = t/\left(\log_2\left(N_0\right)-\log_2\left(N_t\right)\right) = \left(\log_\left\{2^t\right\}\left(N_0/N_t\right)\right)^\left\{-1\right\} = t\ln\left(2\right)/\ln\left(N_0/N_t\right)$

Regardless of how it's written, we can plug into the formula to get

• $N_t=N_0$ at t=0 (as expected—this is the definition of "initial quantity")
• $N_t=\left\left(\frac \left\{1\right\}\left\{2\right\}\right\right)N_0$ at $t=t_\left\{1/2\right\}$ (as expected—this is the definition of half-life)
• $N_t$ approaches zero when t approaches infinity (as expected—the longer we wait, the less remains).

### Decay by two or more processes

Some quantities decay by two exponential-decay processes simultaneously. In this case, the actual half-life T1/2 can be related to the half-lives t1 and t2 that the quantity would have if each of the decay processes acted in isolation:

$\frac\left\{1\right\}\left\{T_\left\{1/2\right\}\right\} = \frac\left\{1\right\}\left\{t_1\right\} + \frac\left\{1\right\}\left\{t_2\right\}$

For three or more processes, the analogous formula is:

$\frac\left\{1\right\}\left\{T_\left\{1/2\right\}\right\} = \frac\left\{1\right\}\left\{t_1\right\} + \frac\left\{1\right\}\left\{t_2\right\} + \frac\left\{1\right\}\left\{t_3\right\} + \cdots$

For a proof of these formulae, see Decay by two or more processes.

### Examples

There is a half-life describing any exponential-decay process. For example:

• The current flowing through an RC circuit or RL circuit decays with a half-life of $RC\ln\left(2\right)$ or $\ln\left(2\right)L/R$, respectively.
• In a first-order chemical reaction, the half-life of the reactant is $\ln\left(2\right)/\lambda$, where λ is the reaction rate constant.
• In radioactive decay, the half-life is the length of time after which there is a 50% chance that an atom will have undergone nuclear decay. It varies depending on the atom type and isotope, and is usually determined experimentally.

## Half-life in non-exponential decay

Many quantities decay in a way not described by exponential decay—for example, the evaporation of water from a puddle, or (often) the chemical reaction of a molecule. In this case, the half-life is defined the same way as before: The time elapsed before half of the original quantity has decayed. However, unlike in an exponential decay, the half-life depends on the initial quantity, and changes over time as the quantity decays.

As an example, the radioactive decay of carbon-14 is exponential with a half-life of 5730 years. If you have a quantity of carbon-14, half of it (on average) will have decayed after 5730 years, regardless of how big or small the original quantity was. If you wait another 5730 years, one-quarter of the original will remain. On the other hand, the time it will take a puddle to half-evaporate depends on how deep the puddle is. Perhaps a puddle of a certain size will evaporate down to half its original volume in one day. But if you wait a second day, there is no reason to expect that precisely one-quarter of the puddle will remain; in fact, it will probably be much less than that. This is an example where the half-life reduces as time goes on. (In other non-exponential decays, it can increase instead.)

For specific, quantitative examples of half-lives in non-exponential decays, see the article Rate equation.

A biological half-life is also a type of half-life associated with a non-exponential decay, namely the decay of the activity of a drug or other substance after it is introduced into the body.

The decay of a mixture of two or more materials that each have different half-lives is not a simple exponential, as each material decays at a rate independent of the other. Mathematically, the sum of two exponential functions is not a single exponential function, A common example of such a situation is the waste of nuclear power stations, which is a mix of substances with vastly different half-lives. Consider a sample containing a rapidly decaying element A, with a half-life of 1 second, and of slowly decaying element B, with a half-life of one year. After a few seconds, almost all atoms of element A have decayed after repeated halving of the initial total number of atoms but very few atoms of element B will have decayed yet as not even one half-life has elapsed. Thus, the mixture taken as a whole does not decay by halves.

## References

1. ^ John Ayto, "20th Century Words" (1989), Cambridge University Press.

# Quotes

Up to date as of January 14, 2010

### From Wikiquote

.Half-Life is a science fiction first-person shooter video game series which consists of two full games, two half-length "episodes", one side-story and three expansion packs; the first game, Half-Life, was released in 1998. The protagonist of the series is Gordon Freeman, a theoretical physicist whose actions at the Black Mesa Research Facility inadvertently create a post-apocalyptic world.^ This page is a full text walkthrough for Half-Life 2 .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ On one side of the house was the hush of death, on the other the din of life.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ About two weeks after the death of Doctor Gordon's wife James went to the post office before beginning his round of calls.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.Expansions of the game Half-Life feature other controllable characters.^ YouTube: Half Life 2 Water Hazard Part 2 (Time: 9:32) Featured Video .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ YouTube: Half Life 2 Walkthrough: We Don't Go To Ravenholm Part 2 (Time: 8:37) Featured Video .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

## Half-Life (1998)

.Black Mesa Transit Announcement System: Good morning, and welcome to the Black Mesa Transit System.^ YouTube: Half-Life 2 Part 10: Welcome to Black Mesa (Time: 7:26) Head downriver.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

This automated train is provided for the security and convenience of the Black Mesa Research Facility personnel. The time is 8:47 A.M... Current topside temperature is 93 degrees with an estimated high of one hundred and five. The Black Mesa Compound is maintained at a pleasant 68 degrees at all times.
This train is inbound from Level 3 Dormitories to Sector C Test Labs and Control Facilities. If your intended destination is a high security area beyond Sector C, you will need to return to the Central Transit Hub in Area 9 and board a high security train. If you have not yet submitted your identity to the retinal clearance system, you must report to Black Mesa personel for processing before you will be permitted into the high security branch of the transit system.
Due to the high toxicity of material routinely handled in the Black Mesa compound, no smoking, eating, or drinking are permitted within the Black Mesa Transit System. Please keep your limbs inside the train at all times. Do not attempt to open the doors until the train has come to a complete halt at the station platform. In the event of an emergency, passengers are to remain seated and await further instruction. If it is necessary to exit the train, disabled personnel should be evacuated first. Please, stay away from electrified rails, and proceed to an emergency station until assistance arrives.
A reminder that the Black Mesa Hazard Course decathlon will commence this evening at 1900 hours in the Level 3 facility. The semi-finals for high security personnel will be announced in a separate secure access transmission. Remember, more lives than your own may depend on your fitness.
Do you have a friend or relative who would make a valuable addition to the Black Mesa team? Immediate openings are available in the areas of "Materials Handling" and "Low Clearance Security." Please contact Black Mesa personnel for further information. If you have an associate with a background in the areas of "Theoretical Physics," "Biotechnology," or other high-tech disciplines, please contact our Civilian Recruitment Division. The Black Mesa Research Facility is an equal-opportunity employer.
A reminder to all Black Mesa personnel. Regular radiation and biohazard screenings are a requirement of continued employment in the Black Mesa Research Facility. Missing a scheduled urinalisys or radiation check-up is grounds for immediate termination. If you feel you have been exposed to radioactive or other hazardous materials in the course of your duties, contact your radiation safety officer immediately. Work safe, work smart. Your future depends on it.
Now arriving at Sector C Test Labs and Control Facilities. Please stand back from the automated door and wait for the security officer to verify your identity. Before exiting the train, be sure to check your area for personal belongings. Thank you, and have a very safe, and productive day.

.Barney Calhoun: [at the start of the game] Hey, catch me later, I'll buy you a beer!^ When he started to follow you I hurried to catch up.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Scientist: Well, so much for the government, their idea of containment is to kill everyone associated with the project! .Judging by your hazard suit I'd say you were part of what went wrong, isn't that right?^ I dare say you are right,” he returned.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I still cling to the idea that Annie Lipton has been putting ideas into her head, in spite of what you say of her coldness before she went there.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Perhaps you are wrong, and your uncle will take measures now this has happened for the second time,” said James.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Now look, if anyone can end this catastrophe it's the science team in the Lambda Complex at the opposite end of the base. .With the transit system out I couldn't tell you how to get there, but there's an old decommissioned rail system somewhere through here, beyond the silo complex.^ The plot outline operates on a system of planned encounters and scripted events, so the story will be identical each time you play through.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ You yourself know how many men I have seen here, and you know I never see men at Annie's.’ There is no one else.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I think it will be perfectly safe for you to take Clemency out driving when there isn't a moon.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.If you can make it through the rocket test labs, you might be able to worm your way through the old tunnels to track down whatever's left of the Lambda team.^ You can't make nothin' of them tracks.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ You might track a fox, but you can't him.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ You've got it your way.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

You can trust them. .You can trust all of us.^ You are too old to behave like a child, and put us all in such a fright.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Poor man, it was dreadful of him to pursue me so, and make us all so unhappy, and of course I never could have married him, even if it had not been for you.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I'm obliged to you, Elliot, but all of us have to face death, whether it is our own or the death of another dearer than ourselves, alone.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Good luck.

HECU soldier #1: So, who is this guy... Freeman?
HECU soldier #2: They say he was at ground zero.
HECU soldier #1: Science Team... do you think he was responsible? Sabotage, maybe?
.HECU soldier #2: Yeah, maybe, all I know for sure is he's been killing my buddies.^ If the time ever comes when you know all, and wish to withdraw, you can do so in my opinion with perfect honor.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Gravitation kills us all in the end, just as surely as if we fell off a precipice.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I have been used to dogs all my life,” said she, “and I never knowed a dog to act like that unless there was somebody about the house.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

HECU soldier #1: Oh yeah, he'll pay. He will definitely pay.

.Security guard #1: Do you think there's a cold beer for us at the end of all this?^ I don't think there ever was a woman so beautiful as she, do you?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ There will be an open door on your left before you reach the guards.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ The wind is on your side of the house,” he said, “and I am afraid you will take more cold.” Clemency stared and pouted, then said, “All right, Uncle Tom!” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Security guard #2: Don't bet on it.

HECU soldier: I didn't sign on for this shit. Monsters, sure, but civilians? Who ordered this operation anyway?

HECU captain: Forget about Freeman, we are cutting our losses and pulling out! .Anyone left down there now is on his own.^ NOTE: There is a Black Headcrab Carrier in a garage down the left side of the alley.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Repeat, if you weren't already, you are now! [radio abruptly cuts out]

.G-Man: [upon completion of the game] Gordon Freeman, in the flesh—or, rather, in the hazard suit.^ He realized that the watching man might easily have mistaken him for Gordon himself, going away with his man to make a call upon some patient.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Gordon forced another upon him, and the man looked as pleased as a child.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Gordon turned upon James a face of such fierce misery that the younger man fairly recoiled.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.I took the liberty of relieving you of your weapons.^ When all your other weapons get destroyed, you are left with only this for the rest of the game.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Most of them were government property. As for the suit, I think you've earned it. The borderworld, Xen, is in our control, for the time being... thanks to you. .Quite a nasty piece of work you managed over there, I am impressed.^ There were a few pieces of Chinese ivory work.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

That's why I'm here, Mr. Freeman. I have recommended your services to my... employers, and they have authorized me to offer you a job. They agree with me that you have limitless potential. .You've proved yourself a decisive man so I don't expect you'll have any trouble deciding what to do.^ Killed, no,” said Gordon, “but he will be if you don't stop crying and making a goose of yourself, Clemency.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I don't know how you've been brought up,” said the elder man.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ There, that's the reason, and I'll tell you the truth,” said the man defiantly.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.If you're interested, just step into the portal and I will take that as a yes.^ TIP: You can also just ride over the platform if you're good on supplies.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ You're either an idiot or just trying to argue for the sake of arguing.
• HL2 - best game of the decade. - General Gaming - General Discussion - MMORPG.com Forums 14 January 2010 7:20 UTC www.mmorpg.com [Source type: General]

^ This should take you across and into the next tunnel.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Otherwise, well... .I can offer you a battle you have no chance of winning; rather an anticlimax after what you've just survived.^ If you will have it, Clara,” he said, “Clemency has a slight pain in her side, and pleurisy and pneumonia are all about, and I told her that she had better take no chances, and the weather has been raw.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I tell you, Georgie K., I've got to have my little joke, just as I've got to have my game of euchre with you and my glass of apple-jack; a man can't be driven too far.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Time to choose...

## Half-Life: Opposing Force (1999)

.Scientist: Oh, you've woken up.^ Once you've pulled them up, you can throw them or set them as traps.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ I don't know how you've been brought up,” said the elder man.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Corporal Shephard is it? I've read the tag on your uniform. .I'm glad to see my life-saving efforts weren't in vain, I can't say the same for him.^ I cannot even bring myself to give you the least hint of what my poor young sister, Clemency's mother, suffered in her brief life with him.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ But I can't help being sorry for him; he must have loved my mother so much, and he must have wasted his whole life; and then to die among strangers so suddenly, poor man.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ It is probable I saved your life, and possibly my own, as well as Clemency from misery.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.[gestures to the dead soldier he tried to revive moments before] I'm afraid you have been through a serious accident.^ I am not afraid now,” said the girl, “but I do think you are very foolish if you go back alone and try to hunt that man.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ If you will sit down on that rock for a moment,” said James, “I have something in my medicine-case which will revive you.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Aim for the head and make sure the attached Headcrab is dead before you move on.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Most of your friends didn't make it. .I was hoping you soldiers had come to rescue us, but now it seems that we are all in the same situation.^ You can take the mare to the stable, and I will run in and get the lie all told before you come.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ It seems a strange thing,” he said, “that Doctor Gordon should hev came and went here for years, and all of us thinkin' his wife were his sister when she were not.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I have told Clara that you have come back, and that Clemency is to stay all night with Annie Lipton,” he said.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.I think I saw a radio near the crash site where I found you, perhaps you can go there and radio for help?^ You can go right in there.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I am not afraid now,” said the girl, “but I do think you are very foolish if you go back alone and try to hunt that man.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I don't think there ever was a woman so beautiful as she, do you?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

I'm afraid these troops aren't going to make it. .I hope you have better luck out there, or I fear none of us will get through this alive.^ I think it will be perfectly safe for you to take Clemency out driving when there isn't a moon.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ For God's sake take the trunk and clear out,” shouted Gordon with unexpected violence, “but if there is a scrap of written paper in that trunk, and you keep it, you'll be sorry.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ You mark my words, there's somethin' out,” said Aaron dogmatically.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

[sparks, randomly changing speed and pitch through the whole clip] Black Mesa Transit Announcement System: This train is inininbound from frorom [garbled] Seccttorr Cccc... .Please keep your legs ininiinside the train at all times.^ I think I must have cared all the time, only at first, when I saw your mother —” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ We are going to be married, but I shall not want to sit on your knee all the time, and what is more, you will not want me to.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

[garbled] have an associate with a background in the areas of "Theothethetheoretical Physicssss?" "biotecchhnology" or other high tech didididisciplines? Please contact our Civilian Recruitment Di-didivision. A rerere- [spark] reminder to all Black Mesa personnenel. [garbled] Regular radiation and biohazard s-ss-sc-screenings are a requirement of continued employment in the in the in thethe- in the Black Mesa Research Facility. .Dododo not- do not attempt to open the dodoors until the trai-i-i-i-in has come to a complete halt at the attheattheatthe- [garbled] station platform.^ Make your way around the outside of the buildings until you come to an open window.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Now arriving a-a-at [garbled]

G-Man: [upon completion of the game] So Corporal Shephard, we meet at last. .Please, don't think that I've been avoiding you, a great many matters require my attention in these...^ You don't think he will come back?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I think I don't know what you mean.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Think of me as your friend, and your friend who is in very great suffering and pain, and have sympathy for me, if you can, but not so much sympathy that you too will suffer.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

troubled times. .I do hope you understand, and now I require a further indulgence on your part: I cannot close my report until every loose end has been tied up.^ Well, ‘all's well that ends well.’ Did it ever occur to you that God made up to mankind for the horrors of creation, by stating that there would be an end to it some day?
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Doctor Gordon does not admit that my case is hopeless, but he gives no hope, and you must have noticed how he suffers when he sees me suffer.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Here, take one of these every hour until the cough is relieved, my friend,” said he.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

The biggest embarrassment has been the Black Mesa facility, but I think that's finally taken care of itself.
[a nuclear weapon detonates in the background]
G-Man: Quite so. But there is still the lingering matter of witnesses. I admit I have a fascination with those who adapt and survive against all odds—they rather remind me of myself. .If for no other reason, I have argued to preserve you for a time.^ You absolutely know of no reason?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

While I believe a civil servant like yourself understands the importance of... discretion, my employers are not quite so trusting and rather than continually subject you to the irresistible human temptation of telling all, we have decided to... convey you somewhere where you can do no possible harm, and where no harm can come to you. .I'm sure you can imagine that there are worse alternatives...^ I ought to go there myself, but if he is worse you will have to go, and to a few others, and I must stay with him.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

## Half-Life: Blue Shift (2001)

.Black Mesa Public Announcement System: Good morning and welcome to the Black Mesa transit system.^ YouTube: Half-Life 2 Part 10: Welcome to Black Mesa (Time: 7:26) Head downriver.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

This automated train is provided for the comfort and convenience of Black Mesa residents and visitors to the Black Mesa Research Facility. .The time is 8:42 AM. Current topside temperature is 91 degrees with an estimated high today of 105. The Black Mesa Compound is maintained at 68 degrees at all times.^ YouTube: Half-Life 2 Part 10: Welcome to Black Mesa (Time: 7:26) Head downriver.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.This train is inbound from the Area 8 Topside Dormitories to the Central Transit Hub in Area 9. Please keep your limbs inside the train at all times.^ I think I must have cared all the time, only at first, when I saw your mother —” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ We are going to be married, but I shall not want to sit on your knee all the time, and what is more, you will not want me to.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.Do not attempt to open the doors until the train has come to a complete halt at the station platform.^ It must have come from the open door of Emma's room at the end of the hall.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

In the event of an emergency, passengers are to remain seated and await further instruction. If it is necessary to exit the train, disabled passengers should be evacuated first. Please stay away from electrified rails and proceed to an emergency station until assistance arrives. .If your intended destination is a high-security area beyond Sector C, you will need to board a high-security train in the Central Transit Hub.^ One is immediately to your left as you enter the enclosed area, the other is down the dock on the left.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ I need not repeat my request that you do not mention your adventure with Clemency this afternoon to her.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ You will need to hold this area until Alyx can expose the core.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.If you have not yet submitted your identity for the retinal clearance system, you must report to Black Mesa personnel for processing before you will be admitted to the high-security branch of the transit system.^ There will be an open door on your left before you reach the guards.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Doctor Gordon does not admit that my case is hopeless, but he gives no hope, and you must have noticed how he suffers when he sees me suffer.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Also note that two more Black Headcrabs will drop down in front of you just before you leave.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.If you wish to transfer to the Sector B or C medium-security lines, you may do so before you reach the Central Transit Hub, at the Area 9 Security Checkpoint.^ There will be an open door on your left before you reach the guards.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Lord, only think what may be before you.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.Access to the medium-security branch of the transit system is for employees of the Black Mesa Research Facility and authorized visitors ONLY and requires that you wear your security badge at all times...^ You and your loyalty are all I have to hold to.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I'll doctor you and all your children and your wife for nothing.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ The wind is on your side of the house,” he said, “and I am afraid you will take more cold.” Clemency stared and pouted, then said, “All right, Uncle Tom!” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

This train is now transferring to the Sector C line of the transit system. This is a medium security area of the Black Mesa facility. .Be sure to wear your identification badge at all times.^ Meh, Half-Life 2 wasn't too exciting for me, but I'm sure Half-Life being my favorite game of all time may have had something to do with it.
• HL2 - best game of the decade. - General Gaming - General Discussion - MMORPG.com Forums 14 January 2010 7:20 UTC www.mmorpg.com [Source type: General]

Now arriving at Area 3 Security Facilities. Please stand back from the automated door until it has fully opened. Before exiting the train, be sure to check your area for personal belongings. Thank you, and have a safe and productive day!
Note: This announcement is not heard every time. It may be skipped as the next map loads.
Scientist: [After a power cut] Oh no... Its probably those Anomalous Materials people again. Always pushing their equipment too hard, dabbling in who-knows-what. I'd be surprised if there's one good brain among them.

Wounded scientist: I appreciate your help, but I'm afraid those bastards did their damage already. .[coughs] If you were trying to reach the freight yards in hope of escaping, then just forget about it.^ You're either an idiot or just trying to argue for the sake of arguing.
• HL2 - best game of the decade. - General Gaming - General Discussion - MMORPG.com Forums 14 January 2010 7:20 UTC www.mmorpg.com [Source type: General]

.The military is rounding up everyone and everything they can find, and either killing them or bringing them up here for questioning.^ Go down the catwalk and run to the other catwalk when you've either expended your pistol rounds or killed all the Headcrabs.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Oh, when they came bringing you in I thought you were killed!
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ They can't get you up here, so you are safe for now.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

So much for a rescue. .A colleague and I came up with our own plan for escape, and we were on our way to one of the old prototype labs when we ran into them.^ Oh, yes, I know hysteria is a good way to account for our own lack of insight,” said Gordon, “and it may be that girls are queer subjects.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ James came up with a shout, and the man disappeared abruptly, with a quick backward glance at James, into the wood.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Shouldn't like to meet him if I had came up to your house an' no one round, and he had took a dislike to me.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.But listen to me: if you still want to get out of here alive your only hope may be to find my friend.^ If I find you or any one else here listening, you'll be sorry for it.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ From here on out, the Antlions are your friends.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ You may be sure of that, and also sure that she still cares for you.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

[coughs] If you can get past the soldiers, find Doctor Rosenberg. .With him you may have a chance to get out of this place...^ Sprint out of the way before you shoot him.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ While you are going back to chase him, he may come up with me.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ You had better get acclimated, become accustomed to your profession in a small place, before you launch out in a city,” his father had said, and the son had acquiesced.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

[the scientist expires]

Stanley Rosenburg: [upon completion of the game] Ah there he is. Calhoun, you've arrived! .When you didn't come through right away we thought that...^ You didn't come by train?” remarked the man.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

oh no, there's something wrong here. Simmons, come look at Calhoun. His body seems to be in some sort of resonance displacement and I...
[Calhoun is teleported to a variety of areas before temporarily stabilizing near two HECU soldiers dragging Freeman along unconscious]
HECU soldier #1: Where are we taking this Freeman guy?
HECU soldier #2: Top-side for questioning.
HECU soldier #1: What the hell for? We got him! .Let's kill him now!^ Let him kill the Zombies.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ He had not slept very well, and now at dawn felt drowsy, but the voices would not let him sleep.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

HECU soldier #2: Err, and if they find the body?
HECU soldier #1: Body? What body? [chuckles]
[Calhoun is teleported back to Rosenburg]
.Stanley Rosenburg: Thank God you made it!^ Well, ‘all's well that ends well.’ Did it ever occur to you that God made up to mankind for the horrors of creation, by stating that there would be an end to it some day?
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

I was worried that a malfunction occurred at the last moment and you might have been caught in an infinite harmonic reflux. If that's the case, you're lucky to be standing here. Then again, we're all lucky. Thanks to you however, we were able to pull off this hare-brained idea. We made it Mister Calhoun, we made it.

## Half-Life 2 (2004)

G-Man: [at the start of the game]: Rise and shine, Mister Freeman, rise and... shine. Not that I wish... to imply that you have been sleeping on... the job. .No one is more deserving of a rest, and all the effort in the world would have gone to waste until...^ He had no more thought of this middle-aged, harsh-featured New Jersey farmer's daughter than he had of one of the dining-chairs.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He said to himself that he did not care if she were old enough to be his mother, his grandmother even, there was no one in the whole world like her.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Now he suddenly realized that a girl was not a woman, and no more to be compared with her than an uncut gem with one whose facets take the utmost light.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

well... let's just say your hour has come again. .The right man in the wrong place can make all the difference in the world.^ That will make me all right.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ All right,” said the red-haired man.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He saw the man place a hand upon the girl's shoulder, and make a motion as if to turn her face toward his.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

So wake up, Mister Freeman...wake up and... smell the ashes.

Barney Calhoun: Now... about that beer I owed you! It's me, Barney, from Black Mesa!

Isaac Kleiner: Right you are. .This is a red letter day, we'll inaugurate the new teleport with a double transmission.^ YouTube: Half Life 2 A Red Letter Day (Time: 9:27) Follow Alyx into the lab.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ A Red Letter Day .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Barney Calhoun: You mean it's working? For real this time? Because... I still have nightmares about that cat.
Alyx Vance: What cat?
.Isaac Kleiner: Now, now, there is nothing to be worried about, we have made major strides since then, major strides.^ It is nothing for you to worry about, dear.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Now he was afraid of fear, and there was something about the man which awakened this terror, yet it was inexplicable.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ She defies her sex,” replied Doctor Gordon, “and still there is nothing mannish about her.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Alyx Vance: [more anxiously] What cat?

Barney Calhoun: [after Gordon is congratulated for being a help in an experiment] Great job, Gordon! Throwing that switch and all, I can see your MIT education really pays for itself.

Vortigaunt: [addressing Freeman after being discovered at a hidden campfire] We remember the Freeman. We are coterminous. .There is no distance between us.^ There is no further need for us to be alone, and there will be directions to be given.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.No false veils of time or space may intervene.^ Oh, no,” she wailed, “I don't want to go so, in the dark, with a thick veil over my face, thinking every minute he may come.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.We see you still in Black Mesa.^ You will see your first Black Headcrab Carrier.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Clearly we see you in the Nihilanth's chamber. We bear witness to the bright eternity of the Nihilanth's demise. You leap, you fall, we see you flash beyond the barriers. .We are there still, in observance of your final stroke.^ NOTE: There are two Black Headcrabs in the final room, on your left as you walk in.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.While our own lay scattered at your feet, you severed the vortal cord that bound the Nihilanth to life, and to us.^ I am no benefactor, you can bet your life on that,” said James.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ You can bet your life you are not.” Again he gathered up the reins.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ It is probable I saved your life, and possibly my own, as well as Clemency from misery.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

That sharp spur of hope has not dulled to this day. For once the lesser master lay defeated, we knew the greater must also fall in time.
For a brief time you joined with us. You are one. Between the worlds. Communion of the Vortessence. And that other: a deeper mystery. No deeper than the void itself. We cannot forget those whose cords you cut. Forgiveness is not ours to bestow. Unity of purpose, the shattering of common shackles, a single road we tread. Your song we sing and shall sing for eternity. No matter the consequences of this struggle. You have brought us grief and jubilation beyond measure. With you beside us, a talisman of victory, the day of freedom draws nigh.
Your bright face obscures your darker mask. We call you sib, although your mind and meaning are a mystery to us. Far distant eyes look out through yours. Something secret steers us both. We shall not name it. We have endured these chafing bonds for eons, yet a single moment of further servitude seems intolerable! How often have we slipped our yoke, only to find it choking us again. Let this war end in either total victory or our extinction. No further compromise shall we allow. We take our stand beside you, here, upon this miserable rock.
The way ahead is dark for the moment. What seems to you a sacrifice is merely, to us, an oscillation. We do not fear the interval of darkness. We are a tapestry woven of Vortessence. It is the same for you if only you would see it. How many are there in you? Whose hopes and dreams do you encompass? Could you but see the eyes inside your own, the minds in your mind, you would see how much we share. We are you, Freeman. And you are us.

Wallace Breen: [addressing the Combine Overwatch, who have failed to apprehend Gordon throughout the game] This brings me to the one note of disappointment I must echo from our Benefactors. Obviously I am not on the ground to closely command or second-guess the dedicated forces of the Overwatch, but this does not mean I can shirk responsibility for recent lapses and even outright failures on their part. .I have been severely questioned about these shortcomings, and now must put the question to you: How could one man have slipped through your force's fingers time and time again?^ You must stop now.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Another time you must do as you are told.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ The plot outline operates on a system of planned encounters and scripted events, so the story will be identical each time you play through.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

How is it possible? This is not some agent provocateur or highly trained assassin we are discussing. .Gordon Freeman is a theoretical physicist who had hardly earned the distinction of his Ph.D. at the time of the Black Mesa Incident.^ James and Clemency had hardly started upon their drive before there was a ring at the office door, and Doctor Gordon, who was alone there, answered it.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ YouTube: Half-Life 2 Part 10: Welcome to Black Mesa (Time: 7:26) Head downriver.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

I have good reason to believe that in the intervening years, he was in a state that precluded further development of covert skills. .The man you have consistently failed to slow, let alone capture, is by all standards simply that—an ordinary man.^ I am not afraid now,” said the girl, “but I do think you are very foolish if you go back alone and try to hunt that man.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I am sorry to leave you alone all the evening, Tom.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I believe in letting bygones be bygones, although you did risk my life and my man's.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Wallace Breen: Well, Dr. Freeman, under other circumstances I like to think we might have been able to work together in an atmosphere of mutual trust and respect. .Certainly, judging from your brief tenure at Black Mesa while I was its Administrator, you showed every promise of becoming a valuable and productive contributor to the scientific process.^ NOTE: There are two Black Headcrabs in the final room, on your left as you walk in.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ You give your wife a spoonful of the medicine in a glass of water every three hours.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.And yet—I'm not sure what spurred you to it—but there is really no place in this enterprise for a rogue physicist.^ You yourself know how many men I have seen here, and you know I never see men at Annie's.’ There is no one else.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ That noon, when he returned from his rounds, he realized that there was to be no cessation.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ You do not realize that you cannot tell a man he is a murderer, and throw him over when he loves you, and yet have him utterly unmoved by it.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Your mentors are partly to blame, of course. My disappointment in Eli Vance and Isaac Kleiner is far greater than my sorrow over your unfortunate choice of career path. In a way, I suppose you could not have done otherwise. Who knows what seeds of iconoclasm they planted when you were young and gullible. But while they certainly share a great part of the responsibility for the recent troubles, it is you alone who have chosen to act with such willful disregard for humanity's future.
Tell me, Dr. Freeman, if you can. You have destroyed so much. What is it, exactly, that you have created? Can you name even one thing? I thought not.

Wallace Breen: [addressing Gordon Freeman while preparing to teleport to the Combine homeworld] "Dr. Freeman, you really shouldn't be out there. At the moment of synapse as I teleport, this chamber will be bathed in deadly particles that have yet to be named by human science. .Perhaps when I'll have the leisure to do the work myself, I'll name one of them after you.^ If I find you or any one else here listening, you'll be sorry for it.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Did you ever think that the desire of distinction was one of the most, perhaps the most, intense purely spiritual emotion of the human soul?
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

That way you won't be completely forgotten! When the singularity collapses, I'll be far away from here; in another universe, as a matter of fact. .You, on the other hand, will be destroyed in every way it is possible to be destroyed and even in some which are essentially impossible!^ Sometimes I even think the medicine would lose its effect if taken in any other way.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ When it does, nobody but you and I must be with him, not even Georgie K. He is getting some rest.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ When all your other weapons get destroyed, you are left with only this for the rest of the game.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

[When the teleport system is destroyed]
Wallace Breen: No! You need me!
Alyx Vance: Yes, you did it! Come on, Gordon! We have to get out of here! Maybe we still have...
[The teleporter explodes, Gordon's perception of events suddenly stops]
G-Man: Time, Dr. Freeman? Is it really that time again? It seems as if you only just arrived. .[G-Man walks out from the explosion] You've done a great deal in a small time...span.^ Stop when you see a man leaning out of a doorway.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Knowledge of, and delight in, evil gleamed out of the sudden brightness of the man's great eyes.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ She's got another feller, or you might git her if you've got a stiddy job,” the man said, winking at James with familiarity.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.You've done so well, in fact, that I've received some interesting offers for your services.^ Go down the catwalk and run to the other catwalk when you've either expended your pistol rounds or killed all the Headcrabs.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Ordinarily I wouldn't contemplate them, but these are extraordinary times. Rather than offer you the illusion of free choice, I will take the liberty of choosing for you... if and when your time comes round again. [extracts Gordon from the Citadel] I do apologize for what must seem to you an arbitrary imposition, Dr. Freeman. .I trust it will all make sense to you in the course of..^ I will make all the arrangements for the funeral, if you wish, Doctor Gordon,” he said.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Poor man, it was dreadful of him to pursue me so, and make us all so unhappy, and of course I never could have married him, even if it had not been for you.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

[pauses and smiles] well, I'm really not at liberty to say. In the meantime... this is where I get off. [the G-Man leaves Gordon in blackness]

## Half-Life 2: Episode One (2006)

Wallace Breen: [First words in the game, mirroring a speech he made at the end of Half-Life 2] Tell me, Dr. Freeman, if you can. You have destroyed so much. What is it, exactly, that you have created? .Can you name even one thing?^ Well, it has to me,” said the doctor, “and let me ask you one thing.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Ten chances to one he is armed, and you haven't a thing to defend yourself with, except that medicine-case.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I did not read a thing in the whole column which even implied such a thing as you intimated,” James said hotly.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

I thought not.

G-Man: [as he is separated from Gordon by the Vortigaunts] We'll see, about that!

[Alyx's pet "Dog" suggests throwing a car containing Alyx and Gordon into the Citadel]
.Alyx Vance: Well, Gordon, unless you've got a better suggestion...^ Well, I suppose I've got to pay it if you ask it,” said Gordon.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Well, you are not exactly the looking object to do anything else,” said Gordon laughing.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ After he was in the wagon Gordon, turning to James, said: “You had better go in the house and stay with the women.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

he is a robot, he's done the math. .sotto voce­] You did do the math, right?^ You did right.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ If you mean about your wife,” James said, “I think you did entirely right.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Still I think you did right,” James said stubbornly.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

[Dog shakes its head in a negative gesture]

Alyx Vance: [entering a Combine control point] I think we just broke about 50 Combine regulations! .No eye contact with Combine soldiers; don't damage Combine property; don't kill the Combine representatives; have your papers out and available; no loud noises after 6 o'clock;...^ You jest run round the house, and in the front door, Miss Clemency, and don't let out the dog, an' see to your ma.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Killed, no,” said Gordon, “but he will be if you don't stop crying and making a goose of yourself, Clemency.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Don't let your heart go out to anybody.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.Alyx Vance: [after watching Gordon single-handedly shoot down a Combine Gunship]" Wow!^ Shoot down the Gunship that comes for you.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ These are useful for shooting down Gunships and Striders.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

[stammers] Jesus, Gordon, you're a real terror!"

Alyx Vance: [Having just observed Gordon destroy a Strider]" You're my new hero!"

## Half-Life 2: Episode Two (2007)

Isaac Kleiner: What you're seeing is the infancy of a superportal. If it retains full strength—
Eli Vance: It will be the Seven Hour War all over again! Except this time we won't last seven minutes!
Alyx Vance: My God ... .Gordon, maybe that's why they were sending so much data from the Citadel.^ Why, where is Clemency?” Gordon said, when they entered the dining-room.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Isaac Kleiner: Data? From the Citadel?
Alyx Vance: In the control room ... they were feeding huge volumes of data directly into the core destruction sequence.
.Isaac Kleiner: Magnusson, did you hear that?!^ He listened, and did hear quite distinctly an exceedingly soft little voice, which might have been the voice of shadows — “Is that you?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Did you never hear of people being opposed to marriages, rich people I mean, and threatening to disinherit a woman if she married the man they did not pick out for her?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I beg your pardon, I did not hear you come in,” he said.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

I bet it's the Combine portal code!
Arne Magnusson: Yes, yes, I'm not deaf!
Alyx Vance: I downloaded the whole packet, and they have been chasing us ever since.
.Arne Magnusson: Well of course they have!^ They could travel as well as horses in the course of time if they only put their minds to it.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.You see Kleiner, it's the lynchpin of all of their plans!^ She will be all right when she sees you safe,” said James.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ You might see to it that the bottles are all filled,” he said.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Isaac Kleiner: I can see that. I never—
Arne Magnusson: Somewhere in that sequence they would've had to establish a connection with the far side. What you have there, young lady, is the specific contact code for the Combine Overworld!
Eli Vance: Good God ...
.Arne Magnusson: If I'm right about this—and I have no reason to doubt myself—you are carrying the very code Doctor Mossman had hoped to recover!^ You absolutely know of no reason?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ You have no doubt at all?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Doctor Gordon does not admit that my case is hopeless, but he gives no hope, and you must have noticed how he suffers when he sees me suffer.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.Now, how soon can you get here?^ You yourself know how many men I have seen here, and you know I never see men at Annie's.’ There is no one else.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Now, see here, Doctor Gordon, can't I be of some assistance if you were to tell me?” asked James.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Now go and have some egg-nog mixed, Georgie K.,” said Gordon, “and bring it here yourself, if you will.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Alyx Vance: Well, we have to get our bearings, but we can't—
Arne Magnusson: There is no time to waste! .We'll need to step up the launch schedule and as soon as you get here with the signature data, we'll encode the satellite and get the damn thing into orbit!^ He was back soon, and James having made up his prescription, went out and got into the sleigh.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I am naturally a man who hates deception, and wishes above all things to lead a life with its windows open and shades up, but I have been forced into the very reverse.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ They can't get you up here, so you are safe for now.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

(Before Alyx gives Dr. Kleiner the data packet.)
Dr. Kleiner: Now, my dear. Where is this data packet you've been carrying? If I delay a single moment, I'll never hear the end of it.
.Arne Magnusson: (In the distance) You have my word on it!^ You mark my words, there's somethin' out,” said Aaron dogmatically.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Vortigaunt: [seeing the body of a person who has committed suicide lying in a chair] A poignant scene. An eternity's repose. It brings peaceful thoughts, does it not?

G-Man: [while the Vortigaunts are healing Alyx, who was impaled by a Combine Hunter] Dr. Freeman ... [pauses time, and begins to speak with his image imposed over several scenes] I realize this moment may not be the most ... convenient for a heart-to-heart, but .I had to wait until your [nods backwards to the Vortigaunts healing Alyx] friends were otherwise occupied.^ He entertained the idea of waiting about until she left her friend's house, then he considered the possible brother, and that the girl herself might resent it, and he kept on.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ To hit them, wait until they start shooting and aim your RPG launcher away from them.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

There was a time they cared nothing for Miss Vance; when their only experience of humanity was a crowbar coming at them down a steel corridor. When I plucked her from Black Mesa, I acted in the face of objections that she was a mere child and of no practical use to anyone. I have learned to ignore such nay-sayers when quelling them ... was out of the question. .Still, I am not one to squander my investments, and I remain confident she was worth far more than the initial appraisal.^ He had no more thought of this middle-aged, harsh-featured New Jersey farmer's daughter than he had of one of the dining-chairs.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Now he suddenly realized that a girl was not a woman, and no more to be compared with her than an uncut gem with one whose facets take the utmost light.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Take my advice, young man, and try to think more of yourself than anybody else in the world.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

That's why I must now ... extract from you some small repayment owed for your own survival. See her safely to White Forest, Dr. Freeman. .I wish I could do more than keep an eye on you, but I have agreed to abide by certain ...^ Thankfully, you never see more than a handful of them.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

restrictions. .[to Alyx] Well now, listen carefully my dear.^ I may as well get it off my mind now.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Now, tell me honest, dear, didn't Uncle Tom ever tell you that that man was in love with my mother before I was born?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.When you see your ...^ You jest run round the house, and in the front door, Miss Clemency, and don't let out the dog, an' see to your ma.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Stop when you see the lambda on your right.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ I wish your father were a widower, then I would marry him the minute he asked me,” said she, “and see how you would like it.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

father, relay these words: "prepare for unforeseen consequences".

.Eli Vance: "Unforeseen consequences". The last time I heard those words was back at Black Mesa.^ YouTube: Half-Life 2 Part 10: Welcome to Black Mesa (Time: 7:26) Head downriver.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.You had just stepped into the test chamber when he whispered them in my ear.^ Just as sure as you do, the door of the worst torture-chamber in creation swings open.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Come into my office, will you?” he said.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Just step into the other room, and I'll be there right away.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.You know who I'm talking about ...^ I know what I am talking about.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ So you don't know anything about it?” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Elliot, you don't know what you are talking about.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

our mutual friend. When he brought in that crystal I knew I should have aborted that damn test, but I didn't. .The whole world went to hell that day.^ It will be better for her if you are not the whole world to her, until you know what a day may bring forth.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

And now ... now he's using my little girl. Putting words in her mouth. God damnit. I should have known when he rescued her, it was for his own damn reasons. .Gordon, there's so much I need to tell you.^ You won't tell him why?” said Emma, and there was alarm in her voice, for she adored Gordon.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ For God's sake take the trunk and clear out,” shouted Gordon with unexpected violence, “but if there is a scrap of written paper in that trunk, and you keep it, you'll be sorry.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He suddenly wondered how much he ought to tell the man, how much Doctor Gordon had told him.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Between us, we may finally have a chance of... [suddenly stops when he notices Alyx is back]

# Strategy wiki

Up to date as of January 23, 2010

### From StrategyWiki, the free strategy guide and walkthrough wiki

Half-Life
Developer(s) Valve Corporation
Publisher(s)
Engine GoldSrc
Release date(s)
Windows
PlayStation 2
Genre(s) FPS
System(s) Windows, PlayStation 2, Steam
Players 1-32
Rating(s)
ESRB: Mature
System requirements (help)

800MHz

128MiB

32MiB

Expansion pack(s) Half-Life: Opposing Force
Half-Life: Blue Shift
Half-Life: Decay
Followed by Half-Life 2
Series Half-Life
.This is the first game in the Half-Life series.^ Does this work for the first Half Life 2 game list???
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

^ Well since people requested it (including me) and it hasn't been done yet, I decided to separate the Half-Life achievements by game myself using Pyroman's guide.
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

^ Half-Life Half-Life 2 Half-Life 2 Episode One Half-Life 2 Episode Two Portal Portal 2 Portal The First Slice Portal Walkthrough Team Fortress 2 The Orange Box The Orange Box Walkthrough Resistance 2 Walkthrough Tom Clancy's EndWar Walkthrough Fallout 3 Walkthrough .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

For other games in the series see the Half-Life category.
.Half-Life was developed by Valve Software and was released on November 20, 1998 for Windows.^ Official blurb: The Escape From City 17 short film series is an adaptation based on the Half Life computer game saga by Valve Corporation.
• DailyGamesNews.com: Video - Half-Life 2 Short Film - Escape From City 17 2 February 2010 7:58 UTC dailygamesnews.com [Source type: General]

^ The intense, real-time gameplay of Half-Life 2 is made possible only by Source, Valve's new proprietary engine technology.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

.Half-Life raised the bar for FPSes, combining action, amazing graphics (for the time), and exciting linear gameplay.^ HALF-LIFE sends a shock through the game industry with its combination of pounding action and continuous, immersive storytelling.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

^ YouTube: Half Life 2 Highway 17 Part 4 (Time: 9:58) Sandtraps .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ YouTube: Half Life 2 A Red Letter Day (Time: 9:27) Follow Alyx into the lab.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.The storytelling in the game is revealed level-by-level through several scripted sequences which places the player in new situations.^ HALF-LIFE sends a shock through the game industry with its combination of pounding action and continuous, immersive storytelling.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

.Half-Life has won 50 Game Of The Year awards from major publications and is considered a marvel in gaming.^ Valve's debut title wins more than 50 game-of-the-year awards on its way to being named "Best PC Game Ever" by PC Gamer, and launches a franchise with more than eight million retail units sold worldwide.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

^ HALF-LIFE sends a shock through the game industry with its combination of pounding action and continuous, immersive storytelling.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

^ Crowbar Ammo: N/A Hotkey: 1 Description: This is the famous Half-Life weapon, although you won't use it all that much.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

## Story

You are Dr. Gordon Freeman, a theoretical physicist who works at Black Mesa, a secret government facility located in New Mexico. .You and your team of scientists are eager to try a new experiment, and you volunteer to be in it.^ You'll find a new member for your crew.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

^ You may not post new threads You may not post replies You may not post attachments You may not edit your posts .
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

.You take a hazard suit and head down to the test chamber.^ Take them down as soon as you're able to.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

^ However, the magnet fails, and you'll land upside down, and take a bit damage.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

^ However, the Combines don't want you to take a bath, and will throw barrels down, including a burning one.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

.Everything is going well, but a major problem occurs in the experiment and now you and the other survivors must escape from Black Mesa alive.^ Although you saw many of his clones, in this game, there is only one Barney, and he seems to remember you ("Hey Gordon, it's me, Barney, from Black Mesa").
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

^ Loading* Keep going, and you'll see Grigori on the other side again, and he'll be shooting Zombies and Headcrabs.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

^ Loading* In the next room (open the door yourself, Alyx will follow YOU now, not the way around), the lights will go out, and Combines will attack.
• Half-Life 2 Walkthrough - IGN FAQs 2 February 2010 7:58 UTC faqs.ign.com [Source type: General]

## Box artwork

editHalf-Life series

Half-Life: Opposing Force · Blue Shift · Decay
Half-Life 2: Episode One · Episode Two

# Gaming

Up to date as of February 01, 2010

### .From Wikia Gaming, your source for walkthroughs, games, guides, and more!^ Even more good performance indications for what you'll get in HL2 and other Source Engine based games like Vampire: Bloodlines. Half-Life Portal - an extensive Half-Life fansite - News Archive #2 14 January 2010 7:20 UTC www.halflifeportal.com [Source type: General]^ After that we will move on to the evolution of the game, how it got to the Source engine, the re-design period, and more! Orion ~ Half Life 2 Total Modification 2 February 2010 7:58 UTC www.orion-project.net [Source type: General]^ Wikia Gaming Create a new wiki Log in Create an account Combine OverWiki View source History Share this article Article Discussion . Gordon Freeman - Combine OverWiki, the Half-Life Wiki - Half-Life, Half-Life 2, Portal, Episode Three, and everything behind-the-scenes! 2 February 2010 14:49 UTC half-life.wikia.com [Source type: FILTERED WITH BAYES]

 Half-Life Developer(s) Valve Software Publisher(s) Sierra Entertainment Engine Half-Life engine Release date November, 1998 (NA) Genre FPS Mode(s) Single player, 1-32 Players Online Age rating(s) ESRB: M Platform(s) PC, Playstation 2 Media CD(PC) DVD(PS2) Credits | Soundtrack | Codes | Walkthrough
PS2 version box art
.Half-Life is a first person shooter developed by Valve Software utilizing a heavily modified version of the Quake engine, dubbed the Half-Life engine, which also included small amounts of the Quakeworld and Quake II source code.^ TTS Oetzel & Goerz GmbH - Terms and Conditions Valve, the Valve logo, Half-Life, the Half-Life logo, the Lambda logo, Steam, the Steam logo, Day of Defeat, the Day of Defeat logo, Counter-Strike, the Counter-Strike logo, Source, the Source logo, and Counter-Strike: Condition Zero are trademarks and/or registered trademarks of Valve Corporation.
• HLstatsX - Realtime Player Statistics for Half-Life 1 and Half-Life 2! - Global Ranking 14 January 2010 7:20 UTC www.hlstatsx.com [Source type: General]

^ Half-Life Half-Life 2 Half-Life 2 Episode One Half-Life 2 Episode Two Portal Portal 2 Portal The First Slice Portal Walkthrough Team Fortress 2 The Orange Box The Orange Box Walkthrough Resistance 2 Walkthrough Tom Clancy's EndWar Walkthrough Fallout 3 Walkthrough .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Wii First Person Shooters .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.Half-Life was released in November 1998 on PC CD-ROM to wide praise and critical acclaim, winning over 50 Game of the Year awards across the globe.^ Does this work for the first Half Life 2 game list???
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

^ Well since people requested it (including me) and it hasn't been done yet, I decided to separate the Half-Life achievements by game myself using Pyroman's guide.
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

^ Xbox360Achievements.org > Games > Shooters > Half Life 2: The Orange Box .
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

Starring a hapless scientist named Gordon Freeman stuck in an Alien Invasion, the game was praised for its cutting-edge graphics (implementing texture decals, skeletal animation and blended lighting), lifelike artificial intelligence, and an immersive storyline. .Upon the release of the software development kit (SDK), Half-Life became one of the most heavily-modded games in existence, spawning a multitude of mods and add-ons, including the most popular online action game in the world, Counter-Strike.^ One Man Army 5 Destroy six gunships in Half-Life 2.
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

^ Originally posted by misterdurp Originally posted by Gameloading Originally posted by misterdurp Originally posted by Gameloading Half Life 2 is one of the overrated games of all time.
• HL2 - best game of the decade. - General Gaming - General Discussion - MMORPG.com Forums 14 January 2010 7:20 UTC www.mmorpg.com [Source type: General]

^ Originally posted by Gameloading Originally posted by misterdurp Originally posted by Gameloading Half Life 2 is one of the overrated games of all time.
• HL2 - best game of the decade. - General Gaming - General Discussion - MMORPG.com Forums 14 January 2010 7:20 UTC www.mmorpg.com [Source type: General]

.In November of 2001, a port of Half-Life for the PS2 was released, feature revamped graphics and a new cooperative episode.^ Once you have successfully completed play of Half-Life 2, we recommend playing the sequels: Half-Life 2 Episode One and Half-Life 2 Episode Two .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Half-Life 2: Episode 2 Achievements: Acid Reflex 5 Kill an acid antlion worker.
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

^ Half-Life Half-Life 2 Half-Life 2 Episode One Half-Life 2 Episode Two Portal Portal 2 Portal The First Slice Portal Walkthrough Team Fortress 2 The Orange Box The Orange Box Walkthrough Resistance 2 Walkthrough Tom Clancy's EndWar Walkthrough Fallout 3 Walkthrough .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

On November 16, 2004, Valve Software released a partially revamped version of Half-Life built on the Source Engine alongside the sequel, dubbed Half-Life 2. Half-Life has had many expansions, mods and sequels. For more information, see below.

## The Story of Half-Life

Half-Life stars the player as Dr. Gordon Freeman, a theoretical physicist employed by the Black Mesa Research Facility in Black Mesa, New Mexico. The BMRF was formerly a military base and missile silo but now serves as a secret underground government laboratory. Freeman was recommended for the position by his mentor from MIT, Dr. Isaac Kleiner.
.The game starts off with Gordon late, heading to his job at the Anomalous Materials Laboratory via the facilities tram transportation system.^ When Doctor Gordon complained irritably, Emma replied with one of her characteristic tosses of the head that she couldn't help it, Doctor Elliot was late.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Gordon started on his long circuit, and James set off to make the rounds of Alton and Westover.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

At the lab, the science team is being hard-pressed by the Administrator to get results with a rare, unusually pure crystal sample. .They decide to push their equipment as hard as they can, but this decision proves to be disastrous as a Resonance Cascade rocks the facility and alien fauna begins to randomly teleport in and around the BMRF. Gordon, who was wearing a HEV (Hazardous Environment Suit, mark IV) at the time of the cascade, managed to survive after getting a brief glipse of an alien world.^ He thought with indignation of Doctor Gordon's warning, as if anything in the world could cause him to change his mind about this dear child who loved him.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ They are,” said Doctor Gordon, “even the old woman herself, who knows well enough that she has not long to live.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ All the time Gordon was talking he was examining James, who was now able to speak feebly.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.Gordon wakes up a short time later to find the BMRF in ruins, and begins to travel to the surface to call for help, along the way catching glimpses of a mysterious man in a blue suit wandering the facility, unaffected by the turmoil.^ Gordon called up the stairs.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ James remained only a short time, since he had the other calls to make.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ About two weeks after the death of Doctor Gordon's wife James went to the post office before beginning his round of calls.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Eventually Freeman learns that the Military has been called in to facility, making reaching the surface even more imparitive. .However, upon reaching the surface, Freeman finds that the Military is not there to rescue anybody; they're under orders to silence facility and cover-up the incident.^ They walked on in silence under a pale sky.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ There was haircloth furniture, and a mahogany table, with various stains of conviviality upon its polished surface.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ When James reached home he had a forlorn hope that he should find Clemency there; that from a spirit of mischief she had taken some cross track over the fields to elude him.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Unable to escape, Gordon is forced deeper into Black Mesa, where he is conscripted by his fellow scientists. .They tell him to head to the Lambda Labs on the other side of the research facility, where they attempting to stop the catastrophe.^ Head out the other side of the sewer.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Annie Lipton is an anomaly,” Doctor Gordon remarked once over his after-dinner pipe, when they sat in the study listening to the feminine murmur on the other side of the wall.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Wait for the train to stop, then jump over it to cross to the other side of the tracks.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

On his way, Gordon manages to launch an important rocket before eventually getting captured. .Freeman is left for dead in a garbage compactor but escapes and continues his journey to the Lambda Complex, only to discover a lab where the alien creatures are locked up, under close observation; and look to have been there prior to the Resonance Cascade.^ She looked up when he entered, and there was in her young girl face the very slightest shade of recognition.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ There is only one thing, I do feel very weak still, and I am afraid I shall look pale.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ At then end of the game in the chapter "Dark Energy", when Breen is trying to escape, simply get up to the part where there are three energy ball fields separated by panes of glass, take out one of the balls and then turn around and look back at the hallway entrance to your left once you have turned around.
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

Freeman continues traveling across the facility on foot, fighting military soldiers and an increasingly hostile alien force. It becomes obvious that the aliens are no longer just randomly teleporting animals, but are in fact a focused alien invasion force, complete with soldiers.
.As he reaches the Lambda Complex, Freeman discovers that they military is pulling out and bombing the BMRF, making it imperative that Gordon reaches the Lambda Team.^ I never thought of such a thing as that,” said Doctor Gordon, driving furiously, but they did not catch up with Georgie K. until they reached the Evarts House, and he was out of his wagon.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Not until afternoon,” replied Gordon, then he relented at her look of disappointment, and suggested that she go with Elliot to make his calls, while he went with Aaron and the team.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ They were now out in the road again, the team plodding heavily through the red shale.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

As he fights into the facility, he makes another alarming discovery: not only was BMRF studying the creatures, they were also experimenting with teleportation. .Gordon fights back an army of alien soldiers to reach the tip of the Lambda reactor where he finds the Lambda team holed up in a supply room.^ Go back through the room with the holes.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Fight your way to the back of the room.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ When they arrived at the hotel, Gordon, after he had tied his horse, took his medicine-case, and, followed by James, entered, and went directly upstairs to a large room at the back of the hotel.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

The supply room was used to equip people exploring an alien dimension, named Xen. Proof that Black Mesa had known about the aliens far before the incident.
The Lambda team informs Gordon of an immense being keeping the portal to Earth open and requests that he kill it. .They power up the generator and send Gordon to the strange dimension of Xen.^ I'll send the money over by Aaron.” Doctor Gordon gathered up the reins, but Sam Tucker seemed to experience a sudden convulsion all over his lank body.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Doctor Gordon had hardly finished speaking before they drew up in front of a white house on the left of the road.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Until they were near home, Doctor Gordon continued his strangely incongruous conversation, telling story after story, and shouting with laughter.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Gordon fights his way through the alien wildlife, past mining camps and even to the heart of an alien factory mass-producing the soldiers Gordon fought on Earth.
Freeman finally reaching the immense being: the Nihilanth. The Nihlanth draws power from crystals mounted on the walls, which are like the pure sample that started the Cascade. Inside the Nihilanth's flower-like head there is similar crystal. Freeman destroys the three crystals on the walls and then manages to damage the crystal in the Nihilanth's head enough to send it into death spasms. Tendrils of energy shoot around the chamber similar to the Resonance Cascade and Freeman is once again teleported into blackness.
.He comes to face-to-face with the mysterious man in blue that he saw wandering through the facility.^ But when Aaron met him in the drive, and he saw the man's frightened stare, he knew that she had not come.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He saw the man in the drive, standing with his face toward the road.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ A man with a serious face, thin and wiry, was coming around the house with a wheelbarrowful of potatoes.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.The man congratulates Freeman on his success, and on how Gordon has done such a fantastic job that the man's employers have authorized him to offer Gordon a job.^ Gordon forced another upon him, and the man looked as pleased as a child.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He realized that the watching man might easily have mistaken him for Gordon himself, going away with his man to make a call upon some patient.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Yes, sir.” The man began fumbling in his pocket, but Gordon stopped him.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

If Gordon doesn't accept then he faces certain death. .The man, who apparently can teleport himself and Gordon at will, opens a portal and waits for Gordon to make his choice.^ He realized that the watching man might easily have mistaken him for Gordon himself, going away with his man to make a call upon some patient.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He found no apparent change in the patient, and tried to persuade Gordon to take a little rest, but the elder man was obdurate.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I am naturally a man who hates deception, and wishes above all things to lead a life with its windows open and shades up, but I have been forced into the very reverse.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.Gordon accepts, much to the mysterious man in blue's delight.^ Gordon offered the man a cigar, which he accepted as if it had been a diamond.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He suddenly wondered how much he ought to tell the man, how much Doctor Gordon had told him.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He thought that he, too, would much prefer staying with Mrs. Ewing than going with Doctor Gordon on the mysterious outing which he had planned.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.The man informs Gordon that he'll see him up ahead.^ He realized that the watching man might easily have mistaken him for Gordon himself, going away with his man to make a call upon some patient.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He could not quite see what Gordon meant, but he took another sip of the golden, fragrant compound before him, and again remarked upon its excellence.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Gordon looked up at him, and his face was convulsed.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

## Characters

### Black Mesa Personnel

.These are Gordon's fellow employees who are also caught up in the chaos caused by the resonance cascade.^ He thought with indignation of Doctor Gordon's warning, as if anything in the world could cause him to change his mind about this dear child who loved him.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

They're both under attack from the Alien Invasion and the Military Cleanup mission, and will aid Freeman as they can.
.
• Scientists - Gordon's fellow scientists aren't the bravest of the bunch, but they're willing to aid Gordon in whatever way they can; whether it's through imparting information, opening a door locked by a retinal-scanner or giving Gordon a shot to help take restore some of his health.
• Security Guards - The security guards of Black Mesa are more than willing to lend a hand in killing the various menaces to the BMRF. Armed with a 9mm Glock, they are deadly accurate for Security Guards.^ Open the door and kill the troops inside.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Go through the open door.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Go through the door Barney opens.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Must be all that free time on the firing range.

### Military

Under orders to silence the facility by way of killing or capturing any non-Military personnel, the Military is ruthless in its execution. .The chain of command keeps even the few Grunts who have second thoughts about the mission to kill civilians from doing anything about it.^ Who is to say that I was right even about that?
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He thought with indignation of Doctor Gordon's warning, as if anything in the world could cause him to change his mind about this dear child who loved him.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I do think he looked like a wicked man, and of course I never could have endured the thought of marrying a man who had been in love with my mother, even if he had been ever so good.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

• Soldiers - The main bulk of the Military's forces, comprised of members of the US Marine Corp, they are highly capable soldier, able to work as a team and employ advanced tactics. .The average Grunt is equipped with grenades and their choice of shotgun or MP5. More advanced soldiers sometimes carry MP5 grenades.
• Assassins - It's not entirely clear who the Black Operatives are working for, but the deadly assassins are equipped with personal cloaking fields, silenced 9mm Glocks and are capable of incredible acrobatic feats.
• Apache - The Apache is a combat helicopter equipped with a machine gun and mini-rockets.^ You can carry 270 rounds for the Submachine gun and 3 rounds for the grenade launcher.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Black Headcrab Carrier: These are humans who have been taken by Black Headcrabs.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Capable of high damage and impossible to take down without explosive arms or high-powered energy weapons.
• Osprey - Having no weaponry of its own, the Osprey instead carries troops into battle. Typically it will hover over a battlefield as soldiers rappel down to the ground.

### Alien Fauna

The wildlife of Xen: It's unknown whether or not they are just the native fauna of Xen, or if they are utilized by the Alien Invaders as an attack force.
.
• Headcrabs - Small aliens who launch themselves though the air in an attempt to attach themselves to the heads of humanoid creatures and take control, mutating them into zombie-like Mawmen.^ She looked at his bent head — James had a curly head like a boy's — and a strange look came into her eyes, as if she were regarding him across an immeasurable gulf.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He shouted with the rest when the first pigeon was launched into the air, and Albert Dodd, a tall, serious young man, fired.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ She sidled into the office like a child who had done something wrong.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Headcrabs seem to prefer dark, tunnel-like areas and are often found in air ducts. .They are also known to burrow into the ground while they wait for prey.^ Shoot them quickly before they dig into the ground.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Wait until the Zombies get into the red zone (look on the ground.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.Headcrabs are produced by a Gonarch (nicknamed the Big Momma), and appear to come in several varieties, there are poisoned headcrabs, fast headcrabs and normal headcrabs, though the first two don't appear until Half life 2. They each produce their own grisly version of a Zombie.
• Mawmen (Zombies) - A Mawman is the gruesome result of a Headcrab's coupling with a human host.^ Zombies: These creatures are the result of Headcrabs getting a hold of humans.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ There are several Swift Headcrabs below.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

The Headcrab mutates the host to grow deadly claws where its hands used to be, and to develop a giant, vertical maw on its chest, giving the Mawman its moniker. .It's rumored that even larger and more mutated zombies lurk in the darker parts of Black Mesa.
• The Gonarch (Big Momma) - An elephant sized creature shaped vaguely like a Headcrab and is the final part of the strange lifecycle of the small parasite.^ There are more Zombies and Headcrabs inside.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ NOTE: There are two Black Headcrabs in the final room, on your left as you walk in.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ They also like to throw Black Headcrabs at you.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.The Gonarch is armor plated except for the large egg sac that dangles beneath its body and can rapidly produce tiny infant Headcrabs, as well as use its powerful legs to attack.^ They make use of the secondary attack on the pulse rifle as well.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Strider: These large, three-legged machines are surprisingly tough and very powerful.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.Additionally, the Gonarch can launch a large glob of biotoxins at its foe, making it difficult to fight.
• Barnacle - Seemingly a long lost cousin of the typical sea barnacle, this red lump of a creature hangs from the ceiling and stretches its long sticky white tongue down to the floor, waiting for prey to walk into it.^ They are easily recognized by their long tentacles that hang from the ceiling.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Wait until the Zombies get into the red zone (look on the ground.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.Once caught, it will draw its prey up into its mouth to eat.
• Houndeye - A small, green, three legged dog-sized creature that has one large, multifaceted eye; travels in packs and can generate a powerful blast of sound that can deafen and disable potential attackers and prey.
• Bullsquid - The natural predator of the Headcrab, and anything else it can find.^ It did not sound like one dog, but a whole pack.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ I am naturally a man who hates deception, and wishes above all things to lead a life with its windows open and shades up, but I have been forced into the very reverse.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ The dog started up at sight of James, but he motioned him down, and went softly out into the hall.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.The Bullsquid is highly aggressive life form about the size of a large dog.^ I have been used to dogs all my life,” said she, “and I never knowed a dog to act like that unless there was somebody about the house.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

It walks on two legs (though not upright) and has several tentacles around its mouth. Due to its aggression, it will attack its own kind just as readily as a Headcrab or human. It will bite, lash with its tail, or even spit a glob of acidic spit at its prey.
• Leeches - Small, white worms that live in the water. .Not capable of doing much damage alone but in large groups can kill you quickly.
• Ichthyosaur - Said to have been hauled from the Challenger Deep, the ichthyosaur is a large sea predator whose true origins are much, much farther away.^ It kills Civil Protection quickly and is useful for long-range shots before you get the Crossbow.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.Capable of swimming at high speeds to chase down it s prey, the ichthyosaur is a deadly predator and caution should be taken when one is suspected to be in the water.
• Snarks - Small living weapons that scramble around until they see a viable target, at which point they will go berserk and pursue the target, attacking viciously until they self-destruct fifteen seconds later.
• Manta Flyer - Large flying creature that bears a resemblance to the manta rays of Earth.^ From this hallway, there will be a group of 7-6 combines, make sure to shoot it as soon as you see the first one, because they spread out more as they move.
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

^ Keep going until you start seeing missiles from a truck coming at you.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Continue down this route until you see a dead end.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Instead of being harmless tourist attractions, however, the Manta Flyer is capable of generating a deadly beam of energy that can take down an osprey. Additionally, Manta Flyers can be used as teleport destinations, allow them to drop troops into battle.
• Tentacle - The Tentacle is a long, green, plant-like creature. It's blind so it hunts by sound, making silence important for sneaking past it unharmed. When it finds its prey, it uses the heavy armour plating at the end of its tentacle to crush the prey, and then drag the mashed creature to the ground beneath it. .Often found in groups of greater than one, however a sole Tentacle is not unheard of.
• Gargantua - The Gargantua is an extremely large, blue armored creature with a small head and four arms, two of which are vestigial and useless.^ Each one contains two to four soldiers.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Yes, it would be difficult for two to walk arm in arm, however loving,” he returned.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ She was a large woman with a great quantity of blue-black hair, which had the ripples one sees in antique statues.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Its armor has the ability to resist most conventional forms of damage, and the its physiology makes it capable of performing incredible features of strength . The primary arms can split open to reveal organic flamethrowers and by stamping its foot, it can generate a streak of energy that can home in on its target.

Sapient, three armed aliens who inhabit the Borderworld of Xen. They utilize organic technology and are apparently telepathic. There's also reason to believe that they are enslaved.
• Vortigaunt (Alien Slave) - A humanoid green alien with one large red eye surrounded by several smaller eyes. The Vortigaunt is capable of generating bolt of green electricity or use it s natural claws to attack foes. .The Alien Slave wears collars and shackles as part of their bondage.
• Alien Grunt - Large, powerful humanoid who grows thick, metallic body armor and wields an alien Hivehand as its primary weapon, and is also strong enough to beat it s opponent senseless, having been witnessed throwing a human through a concrete wall.^ It was clean and sparse, and the furniture had the air of having a past, of having witnessed almost everything which occurs to humanity.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

They are either mass produce, or packaged in factories on Xen.
• Xen Masters (Alien Controllers) - Small and weak aliens with impressive psionic powers. .Capable of flight and generating balls of energy, some of which home in on their targets.^ This applies to those energy balls floating for generators.
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

.Its large, flower-like head, contains a strange, pyramid like structure of unknown purpose.
• The Nihilanth - The immense being capable of holding open the rift to Earth, and who gains his power from the crystalline structures found in Xen, which adorn its chamber, and even contains in its flower-like head - Similar to the Xen Masters.^ I do think he looked like a wicked man, and of course I never could have endured the thought of marrying a man who had been in love with my mother, even if he had been ever so good.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ She looked at his bent head — James had a curly head like a boy's — and a strange look came into her eyes, as if she were regarding him across an immeasurable gulf.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

The Nihilanth bears a resemblance to the Xen Masters and a Human Fetus and features cybernetic augmentation and marks of surgical alteration, which seem incongruent to the organic technology of the Xen aliens. These alterations are theorized to have been done to him by the Combine of Half-Life 2.

### Unknown forces

• The G-man - The mysterious man in blue. .Not much is known about this figure, and even his name is a mystery, having been only nicknamed the G-man by Valve and the fan community.^ Only one face was entirely sober, even severe, as with resolve, and that was the face of a small, mean-looking man between forty and fifty.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He felt at once disgusted and uneasy about the doctor, but as for himself he was only a young man, after all, and sport was still sweet to his soul.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He had a good head for algebra, but a man cannot work out a problem easily with only one known quantity.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.We know that the G-man is employed by some organization, and that he has the capability to teleport himself and others at will.^ He told himself in despair that he could not be sure of knowing when James and Clemency came, and again the awful thought seized him, and again he reflected upon the man outside.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He tried to give the other man a knowing look.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He realized that the watching man might easily have mistaken him for Gordon himself, going away with his man to make a call upon some patient.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

He also seems to have connections with Black Mesa and the military, but his true allegiance is, as yet, unknown.

## Weaponry

• Crowbar - A red and silver stick of metal typically used to pry open manholes. .Probably the most iconic weapon of the Half-Life series, and with the way Gordon waves that thing, it's no wonder why.^ Yes, I think it is,” agreed Doctor Gordon gloomily, “but again, I say, I see no other way out of it.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ He had seen such suffering because of him; his whole life had been so turned and twisted this way and that way because of him, that he himself had in the end become abnormal, and mentally askew, with the system of things.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Gordon knew that the dog's unerring spring would be for the throat; that was the instinct of his race, a noble race in its way, to seize vice and danger by the throat, and attack the very threshold of life.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Can be used underwater.
• 9mm Glock - Holds an 17 bullet clip and does minor damage. Primary fire is normal speed, secondary is fast and inaccurate. Shares it s 9mm ammo with the MP5, which comes in 17 and 50 bullet clips. Gordon can carry a total of 250 rounds. Can be used underwater. (This weapon is a Beretta when using the High Definition pack)
• Colt Python .357 - A large hand canon of a revolver; six chambers each hold a bullet for up to six bullets at at a time. Does a lot of damage and in multiplayer secondary fire allows for a sniper mode. Uses .357 ammo which comes in six bullet boxes. Gordon can carry a total of 36 rounds. .Can not be used underwater.
• Shotgun - Powerful at short range, inaccurate at long range.^ It kills Civil Protection quickly and is useful for long-range shots before you get the Crossbow.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.Primary fire fires a single shot whereas secondary fires two.^ It has two firing modes: single and double.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ It fires super-heated pieces of rebar and will kill any human target in a single shot.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.Carries 8 shells at a time, which come in 12 round boxes.^ Not till my time comes, and not in boxes, then, less I'm in a railroad accident,” replied the girl, with ghastly jocularity.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Gordon can carry a total of 125 rounds. Can not be used underwater. .(This weapon is a SPAS12 when using the High Definition pack)
• MP5 with attached grenade launcher - A submachine gun based on the Heckler & Koch model.^ You can carry 270 rounds for the Submachine gun and 3 rounds for the grenade launcher.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Use the airboat gun to send it packing.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Never use the grenade launcher in close quarters.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.However, this weapon can hold up to 50 rounds, instead of 30, and has an attached grenade launcher.^ You can carry up to 243 rounds for this weapon.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ You can carry 270 rounds for the Submachine gun and 3 rounds for the grenade launcher.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Submachine Gun: This weapon is an H&K MP-7 with a grenade launcher.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Utilizes the same 9mm ammo as the Glock, which come in 17 and 50 bullet clips. Gordon can carry a total of 250 rounds. Can not be used underwater. .(This weapon is an M4 Carbine when using the High definition pack)
• Crossbow - A weapon that fires tranquelizer darts and has an attached scope to allow for longer ranged attacks with secondary fire.^ They make use of the secondary attack on the pulse rifle as well.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

In multiplayer, secondary fire also switches the darts to explosive. Uses dart 5 dart clips and Gordon can carry up to 40 extra darts. .Can be used underwater.
• RPG with Laser Guide - Fires of a Rocket Propelled Grenade which then can be guided to the target with the attached laser sight.^ RPG: This stands for Rocket-propelled Grenade.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Use the laser to guide your rockets.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.Secondary fire turns off the laser sight.^ Go around the side of the fire to turn the gas off.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Uses RPGs, which come in singles, and Gordon can carry five extras. Can be used underwater.
• Tau Cannon (Gauss Gun) - Gauss was a term a unit of measurement magnetic flux density, before being renamed to oersted. Designed at Black Mesa, the experimental, and highly unstable, Tau Cannon prototype operates by generating a powerful magnetic field, similar to a railgun, which fires off particles. Primary fire shoots rapid-fire bolts which can ricochet off walls. .Secondary fire charges up the Cannon until it fires off a bolt that can pass through walls of cetain thickness, killing whatever is behind it.^ I made up my mind I would keep still until I heard a team pass.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Jump up onto the ledge at exit through the other side when the barrels go off.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ A Strider will burst through the wall behind you.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

The Tau Cannon uses a propriety power source from Black Mesa, which comes 20 units to a brick. Can not be used underwater.
• Gluon Gun (The Egon) - Gluons are sub-sub atomic particles that mediate the strong interactions of quarks. How this is turned into a weapon is anyone s guess. .The Gluon Gun (nicknamed the Egon due to its resemblance to the proton packs of Ghostbuster fame) is an experimental weapon designed at Black Mesa that generates a beam of blueish energy that does massive amounts of damage, though it uses energy at a rapid rate.^ Zero-Point Energy 5 Get the Gravity Gun in Black Mesa East.
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

.Secondary fire does nothing unless you use pimary fire, hold down secondary fire, then let go of primary.^ Use it for cover while you hold the position.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Now you must be a good little girl, and let me go.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Let them kill the Zombies before you drop down.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.The blue energy beam will continue to project to wherever you were aiming before, no matter where you look.^ Break the blue beams when you are ready.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ No, I don't think you are, but it is only my duty to put the case plainly before you.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Aim for the head and make sure the attached Headcrab is dead before you move on.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

Useless but it looks funny. The Gluon Gun uses the same propriety energy source that the Tau Cannon utilizes; which come in 20 unit bricks. Gordon can only carry 100 units of energy at any time. Can not be used underwater.
• Hivehand - The Hivehand is the primary weapon of the Alien Grunts. .Gordon can stick his hand into it and use it as well.^ Then she bowed very formally, and shook hands sedately when Doctor Gordon introduced James as Doctor Elliot, his new assistant, and carried off her part very well.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Georgie K. gave Gordon a hearty shake of the hand when he got into the buggy.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.Primary fire shoots heat seeking ÿ¢â⿿¬ÿ⿿thornetsÿ¢â⿿¬ÿ that will home in onto enemies, even go around corners.^ Go around the corner when the machinegun is unoccupied.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Go around the corner.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Go around the side of the fire to turn the gas off.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

.Secondary fire shoots off all 8 thornets in rapid succession without the seeking ability.^ Shoot some of the barrels to set them all off.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

^ Just try and take all the bullets that are fired at them and shoot back.
• The Sorted Achievement Guide for Half-Life 2 - Xbox360Achievements.org 14 January 2010 7:20 UTC www.xbox360achievements.org [Source type: FILTERED WITH BAYES]

The Hivehand will regenerate its ammo gradually until it has 8 again. Can be used underwater.
• Grenades - Standard issue military grenades. Pull the pin and the grenade will explode in five seconds unless the pin is replaced. Gordon can carry 10 grenades at one time. Can be used underwater.
• Tripmines - Tripmines are placed onto walls and emit a laserbeam to the opposite wall. If the beam is broken or the tripmine gets moved, it detonates. Gordon can carry 10 tripmines. .Can be used underwater.
• Satchel Charges - Primary fire drops a charge, and then blows it up.^ Use the Gravity Gun to pull the Hoppers up, then drop them.
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

In order to drop more charges, secondary fire needs to be used. Gordon can carry 5 satchel charges. Can be used underwater.
• Snarks - Snarks comes five to a living nest and can be thrown at certain enemies. .Gordon must be careful that a suitable target is nearby otherwise the Snarks may come back and attack him.^ Then I heard him come back.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ While you are going back to chase him, he may come up with me.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ Doctor Gordon left James there, saying that he would make another call and be back for him directly.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

.Gordon can carry up to 15 snarks at one time.^ I was quite up in the Scriptures at one time.” .
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

^ But this time I am all right.” Gordon gathered up the reins again, and again Sam Tucker stopped him.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

Can be used underwater.

## Related Games

### Expansions

Half-Life had a number of official expansions:
• Half-Life: Opposing Force: An Official Expansion, developed by Gearbox Software and released on PC CD-ROM in November of 1999
• Half-Life: Blue Shift: A Standalone Expansion developed by Gearbox Software and released on PC CD-ROM in June of 2001 (Originally developed for the now-defunct Dreamcast version of Half-Life) Also included a High Definition model pack for Half-Life.
• Half-Life: Decay: A Cooperative Expansion developed by Gearbox Software and released with the PS2 version of Half-Life in November of 2001 (No PC release)

### Sequels

.Half-Life currently has a single released sequel, as well as an expansion for that sequel in production.^ Once you have successfully completed play of Half-Life 2, we recommend playing the sequels: Half-Life 2 Episode One and Half-Life 2 Episode Two .
• Half-Life 2 Walkthrough 14 January 2010 7:20 UTC www.mahalo.com [Source type: General]

In addition, Valve has confirmed that they will do a Half-Life 3.
• Half-Life 2
• Half-Life 2: Aftermath
• Half-Life 2: Episode One
• Half-Life 2: Episode Two
• Half-Life 2: Episode Three (in production)

### Mods

Several official mods were released for Half-Life, including
.There is also a multitude of fanmade mods: Far too many for a complete list here!^ You yourself know how many men I have seen here, and you know I never see men at Annie's.’ There is no one else.
• "Doc." Gordon 2 February 2010 14:49 UTC home.comcast.net [Source type: Original source]

A partial list follows:
• Natural Selection
• Sven-Coop
• They Hunger
• Science and Industry
• Action Half-Life

• Valve Software
• Steam Webpage
• Gamers 2.0 Gamers2.com is a new gamers website with reviews, news, discussion communities. Half Life 3 Fallout is a part of this site.
• Loonygames Interview with Marc Laidlaw
• Half-Life's Code Basis on VERC
• Main Page of the Half-Life Wikia

Half-Life series
Half-Life | Opposing Force | Blue Shift | Decay
Half-Life 2 | Deathmatch | The Lost Coast
Half-Life 2: Episode One | Episode Two | Episode Three
Compilations
The Orange Box
Related Games
Portal | Team Fortress Classic | Team Fortress 2
Miscellaneous
Half-Life Fact File

# Simple English

Half life can mean different things:

# Citable sentences

Up to date as of December 30, 2010

Here are sentences from other pages on Half-Life 2, which are similar to those in the above article.