GamerFitNation writes: Co-op is a fun way to play games. Some games have built a whole separate story around the co-op mode, while others have just added the ability to play the main story with a friend. Some of the games on this list are not necessarily the best games, but they are fun. Now I shall preface this list with an old saying, the amount of fun you get out of a game is the amount of fun you put into it. If you go into these games with a crappy attitude, then the game will probably not be that fun.