There is a bonus zombie mode you can unlock in Call of Duty: Black Ops for the PS3, Xbox 360, and PC called Presidential Zombie Mode.
CIA Database Computer Codes On the Main Menu, and press the Aim and Shoot buttons repeatedly. After about five times for each button, you'll break free of your interrogation chair. When you get up. 3ARC UNLOCK - Temporarily unlocks all levels in campaign and zombies mode. You can unlock all the stages normally by completing the campaign mode. ZORK - Unlocks Zork I. The first way you can unlock all the maps is the hard way. Beat the game on at least regular mode. If you want to unlock only the Arcade mode of Zombies, when you first start up the game, you press start at the main screen. Then your in a room looking at a TV set. Enter '3ARC UNLOCK' as a code to unlock the 'Five' Zombies mode map, Dead Ops Arcade game, Zork: The Great Underground Empire text-based adventure game, and all missions. Enter '3ARC INTEL' as a code to unlock all Intel. Note: Enabling this code will prevent the 'Closer Analysis' achievement from being earned.
You can unlock Presidential Zombie Mode two different ways. You can either beat the game on any difficulty, or you can enter a cheat code on the computer in the main menu.
To access the computer on the main menu, you need to mash the aim and shoot buttons (on PC, just mash the spacebar) until you break free of your restraints. Once you break free, walk up to one of the computers behind you and type in 3ARC UNLOCK to unlock both Presidential Zombie Mode and Dead Ops Arcade.
When you do this, you’ll see a new map in Zombie mode called Five, which is what is referred to as Presidential Zombie Mode.