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Blockdude is a puzzle game written by Brandon Sterner that that originally came with TI-83 and TI-84 graphing calculators.
Since then, remakes have appeared on the internet.
The object of the game is to move the character to the door by moving blocks around the level.
You must fill in ditches and make staircases.
Blocks are picked up by pressing the 'down' arrow on the calculator.
Blocks are dropped by pressing the 'down' arrow.
You move by pressing the 'left' and 'right' arrows, and you press the up arrow to climb.
In all levels except the last, the blocks follow basic gravity rules.
Whenever moved, the blocks fall until they hit a floor.
In the eleventh and last level, some blocks are initially floating and follow regular gravity once disturbed by the player.