Nazi Zombie Mode

So since I just got Black Ops, I've been playing zombies a lot again. I started out playing "Kino der Toten" and have a pretty good feeling for that. Me and my friends have a good strategy and everything. But somebody at my school told me about how you can get up from the chair at the main screen and type in "3arc unlock" to unlock the JFK, FIdel Castro, Robert McNamara and Richard Nixon Pentagon zombies. We unlocked it and played it a few times. I HAVE NO IDEA WHATS GOING ON. At one point, there's a zombie that runs away that we have to chase, then it turns and runs into us, transporting us across the map. I can't find a random box anywhere, there's no where to camp. It's just all running around and teleporting randomly. What is the strategy? How do you do this? It's too confusing. HELP