How to unlock the 2 other zombie maps on COD black ops?

how to get the OTHER TWO ZOMBIE MAPS?How to unlock the 2 other zombie maps on COD black ops?
When your at the main menu, look down at yourself sitting on the chair and start tapping the trigger buttons and the person gets out of the chair then walk to a computer behind you and type in '3ARC UNLOCK' and you should have the maps unlocked.



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to unlock the second map you have to beat the game

to unlock the third you must go to the computer.go to the place where it says campaign multiplayer zombies and options then click left trigger then right trigger back and forth till you stand up,go to the back of the room,find computer,type in doa click enter for the black ops arcade,then type zork to play black ops arcade with peopleHow to unlock the 2 other zombie maps on COD black ops?
You would have had to buy the hardened or prestige copy of black ops... They will be availble for download here in a while.
The hardened copy is only for the zombies maps on World at War has nothing to do with the new maps.How to unlock the 2 other zombie maps on COD black ops?
Not 100% sure but i think you get one for finishing the campaign and one for prestiging