You hit the ball back and forth over the net with another person. If the ball bounces twice on your side, you lose a point. Or if you can not return it and have it bounce once on the other persons side you lose a point. People play to different point totals.
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The most common way of playing the game pong is by using your mouse/controller. While moving your mouse/controller, a rectangular block on the screen will move with it, vertically. You use this block to deflect an incoming ball and bounce it to your opponents side of the screen. If you fail to deflect the ball, a new one appears on the screen and your opponent gets a point, which, in this game, is good.