Klick the Key Arrow up to make the Baseball Player go up, Klick the Key down Arrow to make the Baseball Player go down and the Key right Arrow to hit the Ball. If you let the Ball go past you to the red Line, you get a Minus-Point. If you can hit the Ball before it can touch the red Line, you get a Plus-Point
I have got the Idea when I watched the Tutorial on how to make a Pong game. Also, be sure to check out my other Game named Soccer!