Those mad lads at Rare managed to pack one of the funniest NES co-op experiences and one of the worst, most grueling NES single player adventures into the same game. You can hang out with a friend and be silly little ball-gobbling snakes in the first four or so levels, but don't travel too far or else you'll be subjected to some of the worst level designs ever crafted by human hands and tricked into licking a regenerating human foot on the moon.