Perhaps there is nothing easier than throwing a small ball between rotating spheres with small holes. The goal is to lower it into a small hole located at the very bottom of the structure. Everything would be easy if not for the nuances. Inside each of the spheres are sharp spikes. If the ball hits one of these, it will burst. And the game will end. Therefore, your task is to skillfully balance in order to prevent such troubles. You have to go through many unique levels and show everything that you are capable of.