Of course Left 4 Dead!! L4D2 is sweet!! Gears of War 2 is amazing! I love playing the horde game with friends. See how far you can get! Gets super intense! If you get L4D and COD world at War you will probably never play nazi zombies again. I try to play it ever now and then but it is so boring and dull in comparison to Left 4 Dead. You didn't really say what kind of co-op game you are after. FPS? RTS? RPG?
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