The screen is filled with a tennis court with a tennis player on either side. The player controls the one closer to the screen. The computer player serves a ball, which must be returned with the button when the ball turns red. Depending on the speed of the ball, the ball may have to be returned twice.
1st level difficulty: The ball moves slowly, and is fairly easy to hit. The player has to hit the ball once.
2nd level difficulty: The ball is lower and it moves faster. The player has to hit the ball twice.
3rd level difficulty: The ball is even lower and it moves even faster. The player has to hit the ball twice.