To get points, you have to make it hit the opponents side while their paddle isn't there. The ball can bounce of the walls and paddles. It turns a bit each hit, so be prepared.In one player, you control blue (bottom), left and right arrow keys to move. There is a big difference between difficulties, so don't do one that is to easy or too hard. In two player, the bottom player uses left and right arrow keys and the top player uses a and d to move left and right.
If there's any bug or things that should be fixed, comment it.