You will participate in the most unusual racing adventure in your life. You will have to move a ball. It will jump vertically, competing with your opponent who can survive for a longer period. Your ball will be jumping higher and higher. And the space below will be immediately pierced by sharp knives. You need to hold out longer than your adversary. But, at the same time, you must move really carefully not to damage your ball against sharp blade of the knife. Check it now how skillful you are!