This was honestly one of my favorite games to play with a friend. It has about 10 hours worth of gameplay, but since Slowski and I were derps, it took us about 5 hours extra. The game's mechanics for the co-op is very cool, but can be derpy. It gives you some stuff such as little puzzles to do since it's co-op oriented. The game also gives side missions that focus on the 2nd character of the game "Sergeant John Carver". The co-op is pretty much the same story as the single player campaign, and if you progress in co-op you'll also progress in single player, which I think was pretty neat. There's also a few different modes you unlock after completing the game, like classic mode which only lets you play with original guns and no co-op. ):