Quoting Commander Rye
Cool, but since every boss has a weak spot,where would the weak on the tank be? And would when he is about to die,would he shoot like nuts?
I've thought about that way earlier - He has got 3 lives. The less lives he has, the more bullets he shoots. To hit him, you must outrun the tank (this is not as easy as it sounds) and spin into it from the back side. Then he gets angry and shoots a Bullet Bill at you. You must guide it at the tank. It explodes and hits Quarterseed.