Portal 2 is a marvelous little co-op game that is sure to make you and your buddy close friends. Well, you could also get extremely mad at each other and quickly realize that your friend probably has a jar of chunky peanut butter in their head instead of a brain. You see, Portal 2 is a co-op puzzle game that forces both players to solve complex problems together. This can lead to some very rewarding moments with your friend, but it mostly leads to a lot of screaming until someone has a mental break down and moves away. Deep down, though, isn’t that what friendship is all about?