Once we had the opportunity to breathe and reload, the toddler commenced to opening every door possible. We didn't fare much better - finding ourselves in the company of what were apparently a deaf mute and a three-year-old child, our confused troop made it through several doors, retreating into the best corner possible just in time to defend ourselves from a pack of Flaming Hellhounds. After several attempts to ward off the undead, we finally gave in and went in search of two more comrades in the spirit of 4-player co-op survival. I Have No Clue - you're not going to get very far. The trouble with two-player survival games, however, is that if you're both in the same boat - namely, the S.S. When Nick invited me to play the newest Call of Duty: World at War Nazi Zombie map Der Riese, I was all too happy to oblige.