Just as nightmarish as XKCD's vision of Tetris hell (and the game someone created based on that torturous idea), Not Tetris adds physics to the Russian puzzler and removes the ability to clear lines, removing the satisfaction that comes with locking shapes into place and efficiently cleaning up the area.

This demented version of Tetris' Game Boy edition instead scores you by how many tetrominos you can stack without reaching the top of the screen -- my high score is 32! You can download the PC game for free here. Developer Maurice has also released Not Tetris' source code (written in Lua with LÖVE).