Mr. Blocko is similiar to Tetris but instead of controlling the lines, you control a little square guy who pushes them around. The goal is the same: Clear lines to gain points.
However, you only gain points for the blocks in your color, and the only way to turn blocks into your color is to push them!
The new version, Super Tournament Edition, features, among other things, simultaneous four-player multiplayer, and the ability to customise the game engine to your liking. You can also make your own themes and graphics!