A computer game where you have to line up falling blocks, similar to Tetris. You can play it in classic Tetris mode, where the blocks are tetrominoes, or in "Extreme Geometry" mode, where they are more difficult shapes, including one with a hole in it. To make the game even more difficult you can choose from 16 different boards, including some with solid immovable blocks hanging in mid-air ready to catch your pieces if you're not careful.