BlockDrop is a tetris-like game by Nymus. He sent me this game in by email with information about how it works. It is his first game on DC and his very first complete programming project of any kind.
Due to this fact, it may have a few bugs, but the current build (0.1) is very much playable. This game allows 2 players. You can download the scrambled binary for this game with a readme included here. (Thanks to ZacMC for conversion and upload)