Player 1: W,S Player 2: up arrow, down arrow Ball is served from Y position of serving player. (Serving player's bat flashes before serve.) Game plays till someone scores 5. This can be increased by changing the value of MAX in the bat sprite. (Score display will break over 99 though.)
I've never played the original, so this is based only on a short video I saw on YouTube. I should probably add some sounds! Edit: Fixed big where score didn't reset after first game. Fixed bug where game couldn't even be restarted after first game.