I really enjoy a good cooperative multiplayer videogame. The sad thing is they are pretty rare, even more so back in the days of the Sega Genesis.
I have no idea how much time I sunk into Toejam & Earl when I was a kid. The premise was that two street smart aliens from the planet Funkotron crash their ship on Earth. It's up to you and a friend to collect all the missing parts of the ship while collecting powerups and avoiding all the dangerous earthlings.