Your objective is to pick a character, and fight. You have to damage your opponents enough to be able to eject them out of the arena. You can fight against CPU controlled opponents or you can bring up to 4 of your friends to fight on one keyboard.
Use "W", "A", "S", "D" KEYS to move, press "J" KEY to punch and "K" KEY for special attack. You can take and throw away various objects by pressing "J" KEY. Press SHIFT to activate the shield. Have fun!