Perfect Dark’s excellence comes through in the co-op mode. Every mission can be done together with a friend – online or on split-screen. There aren’t two Joanna Darks, though. One of the players takes control of another character, sometimes not anywhere near his friend. Working across a map and puzzling your way through to each other is the best experience in the game. If you’re not experiencing co-op, you’re not even getting half the game’s value.