Player One (Blue) uses WAD to move, Player Two (Red) uses arrow keys to move., and Player Three uses UHK to move. Here's a cool trick: since I made the players solid, you can wall jump on each other. To attack each other, jump on each other like in Super Mario.
PLEASE NOTE THAT I DID NOT COPY THIS THIS WAS MY OWN GAME!!! (Sorry for yelling.) Check out @AC2323 and @SuperMasterKingJ for more fun games! @GG4Real is also a good coder, and my best friend in real life.