Dynamite Headdy. It's an old overlooked Genesis/Megadrive Classic. Probably the second best platformer of the system.
I don't expect most people to know about it, since it was so unpopular.
The game involved you progressing by shooting your head at various things. Sounds weird at first, but once you're used to it it's a lot of fun. It comes complete with various mini-games and bosses that at times it makes Sonic 3 & Knuckles look quite inferiour.
The game itself is very challenging, I still haven't completed it :-(.
I recommend you try it at least once... ...if you can get a hold of it.
EDIT: I recieved your PM AstralLemming. Hopefully this will give you the answer you require.