If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Choose your two players as well as two players against you. The winner becomes the one who first get fifteen points. All of these players can be personalized in certain way so enjoy the game.
Arrow keys - To move.
D/Space bar - Jump.
S - Pass/Submission.
A - Attack/Smash/Block.