Belts is a mechanical labyrinth. It’s a belts that turns around and you have to keep your ball at the top. Do not fall off. When you manage one revolution the speed increases, but that’s alright, you have already manage one revolution. What do you think happens after the second revolution? Correct, the speed increases even more. The fourth revolution? The speed increases even more and now it’s very difficult to keep the ball on the belt. Try it!