This is 2D Tennis (Based off the first video game "Tennis for Two). Once you press the Play button, you will have too be WSD or Up, Down, and Left arrow keys. If you are WSD, your on the left. Otherwise, your on the left. Your trying to score on the other team by pressing the attack button. By the way if the ball touches the net you'll have to restart the simulation. Good Luck & Have Fun.
Thanks William Higinbotham