Pong was one of the first computer games where the goal was to beat your opponent by being the first to get 10 points. When your opponent hits a ball, you get a point.
To move your paddle, use the arrow keys. In a two-player game, W and S are used to move the paddle of the player on the left. To win the game, you must score 7 points.
If you want to play ping pong in a new way, try the "action mode." Each round has a different rule that changes how the game is played. Most of them are pretty easy to understand, but some of the special modes let you win in different ways.
Have fun and good luck!