move P1 with w and s, and up and down arrows for P2. try not to let the ball hit your side. you have 2 minutes to play for the higher score. if you do singleplayer instead, you have to use P1 and instead of scoring (because there will be no P2), try to stop from being scored on.
Feel free to remix it and mess around with the physics if you want. I have put up many comments around to explain everything.