Switching characters can completely change the way a stage plays, from reckless gunfire and close-range brawling to blowing holes through whatever happens to be in the way. The scenery rarely survives the encounter either, so a carefully chosen route can vanish along with half the building, sometimes taking your teammate with it. This fan-made Android port comes with the fully unlocked version, giving access to the complete content, while co-op is where the nonsense really takes over; later alien and demonic bosses then put the brakes on the comedy with some genuinely tough fights.