A very simple game at first glance. Each round, the walls close in, and before they close, you need to place a sphere in a safe spot using the mouse. Every 5 rounds, the walls move faster and the sphere's size increases. That's the whole game. Sometimes there might be no safe zone, but that's okay; you don't have to place spheres all the time. The round will simply be restarted, and the game will continue, not be interrupted.