Well, there is 2 balls and one is fake. You have to find out which one is the fake one. You can tell because, the real ball, if it touches the paddle, you will gain 5 points and if the real ball touches the red thing, you will lose 5 points. As for the fake one, it will just move and it won't gain or lose any points. You don't have to use the arrow keys because you have to move your mouse to move the paddle. If you don't get what I mean, please comment below. Also, the fake ball won't make the laser sound if it touches the red thing.
By the way, I am just a beginner, my dad really helped me.