This app is like playing Pong, where you defend a goal using a paddle. The major difference in this app is that multiple balls may be on the screen at any one time. (The original Pong would never have more than one.) If the last ball on the screen passes by your paddle, then your opponent gets a goal. The game ends when a player reaches the goal limit, or when time runs out.
Your paddle is equipped with a laser, which can cut holes in your opponent's paddle. Balls are able to pass through these holes, making them increasingly harder to hit.
At the start of a round, one or more balls will be placed onto the field. When you hit a ball, it's color will change to that of your paddle. This means that you 'own' the ball. When one of your balls hits a powerup, which are represented by small gray blocks, you'll receive that powerup. Blocks can do other things besides giving out powerups. Some can change the ball's traits, such as it's speed or movement, while others can adjust the number of balls on the field.