Beavis and butthead is a remarkably fresh coop game with same very nice puzzles.

User Rating: 7.7 | MTV's Beavis and Butt-head GEN
Beavis and Butthead is all about the coop. While it is possible to play this game by yourself, it loses alot of its charm that way. The fun thing to do is to run through this one together and experience the same comraderie as the title characters (that is to say beating each other senseless when you lose that last life). The puzzles are difficult enough to cause the game to offer some challenge, but it can easily be accomplished in a single sitting. While the sound is slightly tinny, and the muzak rather bad, the graphics shine as very good quailty for the Genesis and manage to make the game work. Highly recommended over the SNES game of the same name.