WASD for p1, arrows for p2, TFGH for p3 and IJKL for p4. Space to select. L to leave the lobby.
One of the many versions of Pong. If you have any suggestions, post them in the comments. I will admit, this is definitely not the best but, where else do you find 4 player games? Updates in 2.1: Fixed the very basic Multiplayer Online section, Made the Offline section reusable, Improved 3 and 4 player mode scoring. Added sound! (yes, it's the retro stuff)
