I don't think I've ever regretted replaying a game more in my life. See, as a kid, I thought this game was a fun co-op adventure where you're going through all these trippy worlds and wow what a cool game. Going back to it as an adult with a friend of mine in co-op, I had completely blanked on the existence of friendly fire in this game. Not only does it have friendly fire, the friendly fire freezes the other player for close to 5 seconds. It happened twice before we both went "no. no way." Sometimes you beat games as a kid cuz it's all you've got so you might as well.