You are the white ball. Move with the mouse, and explode yourself with the left mouse button. There are no other controls. Red balls are the basic enemy. Explode yourself next to them to blow them up, and try to make chain reactions to blow up as many red balls as possible with each explosion. Every time you explode, you lose 5 seconds. If a red ball touches you, you automatically explode and also lose 10 seconds. If a chain reaction is already occuring, you can not explode yourself, but you can still be exploded by red balls. This will add to any chain that's already happening, and can be used to your advantage. Green balls are created when you blow up red balls. Green balls cannot hurt you, and can not be blown up, but when they reach the edge of the screen they wrap around as red balls. During boss fights, green balls will attack the boss, which is the only way to hurt it. Purple balls can hurt you, but you can NOT hurt them. Like green balls, they turn red when they wrap around the edge of the screen. Purple balls are fired by bosses, and by falling stars. If you see a falling star, get out of its way.