These cheats are for the Xbox 360 version but should work on the PS3 as well (sorry PC and Wii)
  • Cheat modeAt the main menu, use the Right Analog-stick to look down at your hands and see you are locked up. Repeatedly press LT + RT to escape from the chair (unlocks the “Just Ask Me Nicely” secret achievement). After breaking free, move around to the area behind your chair to find an old computer terminal you can use to access the Central Intelligence Agency Data System. Type one of the following codes to access early unlockables and hidden features in the game. Note: You can also plug a USB keyboard into your Xbox 360 to enter the codes and play the Zork text-based adventure game.
      Mission select, “Five” Zombies mode map, Dead Ops Arcade game, and Zork gameEnter “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.

      All IntelEnter “3ARC INTEL” as a code to unlock all Intel. Note: Enabling this code will prevent the “Closer Analysis” achievement from being earned.

      Alicia gameEnter “ALICIA” as a code to unlock the Alicia virtual therapist game.

      Dead Ops Arcade gameEnter “DOA” as a code to unlock the Dead Ops Arcade game, which is a zombie killing mini-game similar to Smash TV. Use the Left Analog-stick to move and the Right Analog-stick to shoot. Note: Play the Dead Ops Arcade game to get the “Insert Coin” achievement.

      Zork gameEnter “ZORK” or “HELLO SAILOR” as a code to unlock the Zork: The Great Underground Empire text-based adventure game. Note: Play the Zork game to get the “Eaten By A Grue” achievement.

      Display all commandsEnter “HELP” as a code to display a list of system commands in the terminal and Pentagon user e-mail access.

      Open corresponding fileEnter “CAT [filename]” or “PRINT [filename]” as a code to open the corresponding file.

      List audio files and picturesEnter “DIR” as a code to display a list of audio files and pictures for use with “CAT” command.

      List of login namesEnter “WHO” as a code to display a list of login names for use with the “RLOGIN” command (requires passwords).

      LoginEnter “LOGIN” as a code to login with a corresponding username and password.

      Open mail folder for current userEnter “MAIL” as a code to open the mail folder for the current user.

      Display contents of current directoryEnter “DIR” or “LS” as a code to display the contents of the current directory.

      Encode a string using the CIA's cypherEnter “ENCODE” as a code to encode a string using the CIA's cypher.

      Decode a string using the CIA's cypherEnter “DECODE” as a code to decode a string using the CIA's cypher.

      Display “Fee Fie Foe Foo!”Enter “FOOBAR” as a code to display “Fee Fie Foe Foo!”.

  • Dreamland serverAccess the Central Intelligence Agency Data System. Enter “rlogin dreamland” as a command. You will be prompted to login with an account with MJ12 access. Use one of the following usernames and passwords to continue:
      Login as Robert Oppen: Username: “roppen“, Password: “trinity”
      Login as T. Walker: Username: “twalker“, Password: “thanksdad”
      Login as Vannevar Bush: Username: “vbush“, Password: “majestic1”
  • Terminal accessAccess the Central Intelligence Agency Data System. Enter “login” as a command. You will be prompted to login with an account. Use one of the following usernames and passwords to continue. You can then access their documents with the “dir” command or e-mail with the “mail” command.
    Person Username Password
    Adrienne Smith asmith roxy
    Alex Mason (default account) amason password
    Bruce Harris bharris goskins
    D. King dking mfk
    Frank Woods fwoods philly
    Grigori “Greg” Weaver gweaver gedeon
    J. Turner Jturner condor75
    Jason Hudson jhudson bryant1950
    John McCone jmccone berkley22
    Joseph Bowman jbowman uwd
    John F. Kennedy jfkennedy lancer
    Lyndon B. Johnson lbjohnson ladybird
    Richard Nixon rnixon checkers
    Richard Helms rhelms lerosey
    Richard Kain rkain sunwu
    Ryan Jackson rjackson saintbridget
    T. Walker twalker radi0
    Terrance Brooks tbrooks lauren
    Vannevar Bush vbush manhattan
    William Raborn wraborn bromlow
  • Secret GamerpicsEscape the interrogation chair by repeatedly pressing LT + RT at the main menu to unlock the Frank Woods Gamerpic. Log into Jason Hudson's account on the terminal to unlock a Jason Hudson Gamerpic.
  • Hidden Thunder Gun in “Numbers” missionAt the beginning of Mission 7: Numbers, after the Nova 6 Gas is released, go to the back of the room, and enter the office. Find the tape recorder, and hold [Action] to pick it up. If done correctly, the screen will shake. Continue through the level until you get to the part where you jump off the roof into the building and onto the mattress. Once Clarke is inside, he will move a fridge leading to the weapon stash. You must watch him move the fridge or you will not get the Thunder Gun. Once you get inside the stash, go to the left. You should see another tape recorder. Walk up to it, and hold [Action] to pick it up. If done correctly, the screen will shake and the Thunder Gun will appear from the wall. You can trade the weapon you are holding for it, and it will be equipped with twelve shots. After you get the Thunder Gun, the rest of the level should be very easy.In Mission 7: Numbers, after interrogating Clarke, several enemy soldiers will appear at the end of the long hallway. If you shoot all six Nova 6 canisters (two in the back, four on the sides), you can retrieve a cassette tape in the office behind where you started. Note: It is recommended that you toss a flashbang to blind the enemies so you can shoot the canisters more easily. Once you pick up the tape, continue progressing through the mission until the part where Weaver and Clarke both jump off the roof and onto a mattress. After they jump down, Clarke will ask Weaver to help him move a fridge out of the way to his first weapon stash. Once they do, go inside, and look to the left. There should be a place to put the cassette. Note: When picking up and placing the cassette tape, the game will not prompt you to do anything — you must use this information to know when to do these things. Once you insert the cassette tape, the screen will shake, and the Thunder Gun will appear out of the wall. It has twelve bullets, and it is reloaded at checkpoints.
  • All Zombie mapsSuccessfully complete the indicated task to unlock the corresponding Zombies mode map:
      Dead Ops Arcade: Play the Dead Ops Arcade game. The map description reads “Step back through time with this retro arcade zombie adventure and do battle with the forces of the Cosmic Silverback.”
      Der Riese: Requires a unique code that is included with the Call Of Duty: Black Ops Hardened and Prestige Edition.
      Five: Successfully complete Campaign mode on any difficulty. The map description reads “The Pentagon is under attack! Washington is going to DEFCON 1 in this installment of “Zombies”.”
      Kino Der Toten: Available at the start. The map description reads “Battle the undead in this theatrical installment of “Zombies”. New twists and clues could uncover the final plan. It's show time!”
      Nacht Der Untoten: Requires a unique code that is included with the Call Of Duty: Black Ops Hardened and Prestige Edition.
      Shi No Numa: Requires a unique code that is included with the Call Of Duty: Black Ops Hardened and Prestige Edition.
      Verruckt: Requires a unique code that is included with the Call Of Duty: Black Ops Hardened and Prestige Edition.
  • Finding the Pack-A-Punch on Five map in Zombies modeMake a crawler, then go into the middle room, and adjust the DEFCON level to DEFCON 5. All teleporters will take you to the Presidential Suite. All switches are in that room; three are upstairs and one is downstairs.