Chain Reactorz is a level-based puzzle game in which you control a gun at screen bottom. At various locations on the screen are "atoms," and you must "destablize" them by hitting them with your bullets. Each bullet has four prongs, at 9 degree angles from each other, and it loses one with each bounce, fading away after the fourth is lost; when it hits an atom, it sinks slowly toward the "nucleus." As it does so, you may rotate it so that the prongs point in different directions; when it reaches the nucleus, it explodes, emitting a new bullet in each direction pointed by a prong. These bullets can, of course, impact other atoms.