Breaktris is a two-player mash-up of Breakout and Tetris, developed with love for the 2012 MolyJam. One player controls the paddle with the mouse to play Breakout on the left-hand side of the screen. The other player uses the arrow keys to play Tetris on the right-hand side of the screen.

Player one messes with player two by breaking enough bricks to get the ball passed the top of the screen and down into the right hand side, where it wreaks havoc on the completion of player two's Tetris lines. Player two messes with player one by completing Tetris lines. For every line successfully created by the Tetris player, another line of bricks bears down on player one.

It's a fun proof of concept.. but only with two players. You can download it here.