This is an odd one. It's Sonic 2 only the rings have been replaced with onion rings. The more you collect the fatter and slower Sonic gets. If you collect too many Sonic struggles to breathe and dies. The necessity of avoiding the rings adds a new challenge to the game plus the new animations are quite hilarious. This is one of our favorites and until now we only offered it at retro game shows and to close friends. Definitely get this one, there's nothing out there like it.