While the match-three space in the App Store couldn't be called anything but downright crowded, Compression manages to keep things interesting. You control blocks that drop from the top of the screen and attempt to match these blocks to the hollow pieces in order to get three of the same color in a column or row, which removes the pieces from the game board.
The twist in Compression's gameplay is in the walls, which move in closer and closer in a set pattern after every third piece is dropped into the board. A set of white dots appear on the section of the wall (either bottom, left, or right) that will compress inward next, so players can tailor their placement of blocks to best deal with the walls, which can remove blocks from the field if there is no more room for them after the board gets compressed.
In short, Compression just gets it right. The core gameplay is different enough to set it apart from the umpteen-million other match-three games on the App Store and simultaneously familiar enough that anyone can pick up the game and be relatively adept within minutes. Don't miss today's chance to grab the game for free.
App Store Link: Compression, Free (today)