Use the arrow keys. Press 1 to become P1, and press 2 to become P2. Press 0 to stop playing.
This is just a test, I guess. This is also my first multi-player game. v1.0.0: Published v1.1.0: New sprites. v1.2.0: 3rd player added. v1.2.1: Minor bug fix. v1.3.0: 4th player added. Hopefully it works now. v1.3.1: 2 players have been named. (P2 is Cyclop, P4 is Penta) v1.3.2: Another player has been named. (P1 is Smiley)