LOCKJAW is a tetromino stacking game that lets you set the rules. It’s a free software implementation of the Soviet Mind Game, a highly popular computer puzzle game that involves guiding tetrominoes into a well. (That is, LOCKJAW is to Tetris as GNU is to UNIX.) It includes over 20 options for making variations to the game rules, as well as “gimmicks” for practicing specific skill areas. It is known to run on PC, Game Boy Advance, and Nintendo DS.

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