Unlock All Available* Zombie Maps
To do this, you must start at the Main Menu and press RT and LT at the same time a few times until Alex Mason gets up out of the chair. Now, there will be a computer behind the chair. Go over to it and press and hold X. Now, enter the code "3arc unlock". This will grant you access to all available Zombie Maps, including Dead Ops Arcade.
*Does not unlock Nazi Zombie maps on the Prestige Edition on the Regular game.
Added by: 1122andyozz33 Dec 14th 2010, ID#6726