While at the main menu, use the Right Analog-stick to look down at your hands and see you are strapped to a chair. Press LT and RT repeatedly to escape(You will get the “Just Ask Me Nicely” secret achievement). After escaping the chair, walk behind it and you will find an old computer terminal that can be used to access the Central Intelligence Agency Data System. Type these codes in the terminal to access early unlockables and hidden features in the game. You can use a USB keyboard plugged into your Xbox 360 to enter the codes and play Zork.
Enter “3ARC UNLOCK” into the terminal to unlock the Dead Ops arcade, Zork: The Great Underground Empire text-based adventure game, “Five” Zombies map, and all of the campaign missions.
Unlock All Intel
Enter “3ARC INTEL” into the terminal to unlock all Intel. This will prevent you from earning the “Closer Analysis” achievement.
Dead Ops Arcade
Enter “DOA” into the terminal to unlock the Dead Ops Arcade, which is an arcade version of the zombie game type. In the game the Left Analog-stick will be used to move and the Right Analog-stick will be used to shoot. Playing Dead Ops Arcade will earn you the “Insert Coin” achievement.
Alicia The Therapist
Enter “ALICIA” into the terminal to unlock the Alicia virtual therapist game.
Zork game
Enter “ZORK” or “HELLO SAILOR“into the terminal to unlock Zork: The Great Underground Empire text-based adventure game. Playing the Zork will earn you the “Eaten By A Grue” achievement.
Show commands
Enter “HELP” into the terminal to display Pentagon user e-mail access and a list of system commands in the terminal.
Display pictures and audio files
Enter “DIR” into the terminal to show a list of pictures and audio files for use with “CAT” command.
Open files
Enter “PRINT [filename]” or “CAT [filename]” into the terminal to open the File it corresponds with.
Login names
Enter “WHO” into the terminal to display a list of names to log in with for use with the “RLOGIN” command ( This will require passwords).
Login
Enter “LOGIN” into the terminal to login with a username and password.
Display current directory
Enter “LS” or “DIR” into the terminal to show the current directory.
Open mail folder
Enter “MAIL” into the terminal to open a mail folder for the current user.
Decode a string with the CIA’s cypher
Enter “DECODE” into the terminal to decode a string with the CIA’s cypher.
Encode a string with the CIA’s cypher
Enter “ENCODE” into the terminal to encode a string with CIA’s cypher.
“Fee Fie Foe Foo.”
Enter “FOOBAR” into the terminal to display “Fee Fie Foe Foo!”.
- Access the Central Intelligence Agency Data System. Enter “rlogin dreamland” into the terminal. You will need to login with an account that is MJ12 accessable. Use one of these usernames and passwords to continue:
- Login as Vannevar Bush: Username: “vbush“, Password: “majestic1“
- Login as Robert Oppen: Username: “roppen“, Password: “trinity“
- Login as T. Walker: Username: “twalker“, Password: “thanksdad“
- Access the Central Intelligence Agency Data System. Enter “login” into the terminal. You will need to login with an account. Use one these usernames and passwords to continue. You can then see their documents using “dir” command or e-mail using “mail” command.
| Username | Password | Person |
| asmith | roxy | Adrienne Smith |
| amason | password | Alex Mason |
| bharris | goskins | Bruce Harris |
| dking | mfk | D. King |
| fwoods | philly | Frank Woods |
| gweaver | gedeon | Grigori “Greg” Weaver |
| jturner | condor75 | J. Turner |
| jhudson | bryant1950 | Jason Hudson |
| jmccone | berkley22 | John McCone |
| jbowman | uwd | Joseph Bowman |
| jfkennedy | lancer | John F. Kennedy |
| lbjohnson | ladybird | Lyndon B. Johnson |
| rnixon | checkers | Richard Nixon |
| rhelms | lerosey | Richard Helms |
| rkain | sunwu | Richard Kain |
| rjackson | saintbridget | Ryan Jackson |
| twalker | radi0 | T. Walker |
| tbrooks | lauren | Terrance Brooks |
| vbush | manhattan | Vannevar Bush |
| wraborn | bromlow | William Raborn |
Unlockable Gamerpics
- Escape the interrogation chair by pressing LT and RT repeatedly while at the main menu to unlock a secret Frank Woods Gamerpic.
- Log into Jason Hudson’s account on the terminal to unlock a secret Jason Hudson Gamerpic.
- In the zombie map Call of the Dead(Escalation DLC) find the vodka bottle, and save the original characters from the time travel machine to unlock a secret Gamerpic.
Thunder Gun Hidden in “Numbers” mission
- At the beginning of the seventh mission: Numbers, following the release of Nova 6 Gas, head towards the back of the room, and go into the office. Find the tape recorder, and hold “X” to pick it up. If this is done properly, your screen will shake. Continue through the level until you reach the part when you jump off the roof into the building and onto the mattress. Once inside, Clark will move a refridgerator leading you to the weapon stash. You have to watch him as he moves the fridge or you will not be able to get the Thunder Gun. Once you get inside the location of the weapon stash, you will need to go to the left. You will see another tape recorder. Walk up to it, and hold “X” once again to pick it up. If done correctly, your screen will shake again and the Thunder Gun will appear on the wall. You can trade your current weapon for the Thunder Gun , which will come equipped with 12 bullets. After you attain the Thunder Gun, you should be set for the rest of the level .
Unlock Wunderwaffe in Call of the Dead Zombie Map
(Escalation DLC)
- Complete the Easter EGG (guide to completion coming soon). Once George is killed he will drop the Wonderwaffe instead of the Death Machine.
Multiplayer Unlockables
These are the things you unlock with each rank
- Level 4: Create A Class
- Level 5: Contracts
- Level 6: Clan Tag
- Level 8: Game Mode Challenges
- Level 10: Killstreaks, Killstreak Challenges, Playercard Emblems
- Level 13: Combat Record
- Level 15: Medal Challenges
- Level 16: Gun Emblems
- Level 19: Gun Tag
- Level 20: Elite Challenges
- Level 22: Camo
- Level 25: Reticules
- Level 28: Lenses
- Level 30: Last unlockable Challenges
- Level 31: Facepaint
- Level 50: Prestige Mode
- Prestige 1: Prestige Leaderboard, Custom Class #6
- Prestige 3: Custom Class #7
- Prestige 5: Custom Class #8
- Prestige 7: Custom Class #9
- Prestige 9: Custom Class #10
- Prestige 10: Prestige Hardcore Playlist
- Prestige 11: More Face Paint
- Prestige 13: Clan Tag Colors
- Prestige 14: Gold Camo
- Prestige 15: Prestige Pure Playlist
Perks
This is a list of perks, which are unlockable by the challenge being completedLightweight
- Makes you move faster.
Lightweight Pro: makes you move faster and you will not recieve damage from falling.
- complete 15 melee kills, stay alive 5 times after being close to death, and earn 10 offense medals by killing enemies near their objective.
Scavenger
Scavenger Pro: Collect ammo tactical and lethal grenades from dead enemies, and you'll begin the game with extra mags for your gun.
- Resupply 150 times using Scavenger, complete 5 lethal grenade kills with a grenades collected with scavenger, and get 5 kills without dying 5 different times.
Ghost
- Invisible to enemy spy planes.
Ghost Pro: Invisible to spy planes, Infrared scopes, aircraft and sentry guns, along with no name or red cross hair when targeted by an enemy
- Kill 20 enemies with a spy plane or Blackbird enabled, Destroy 30 aircraft with a non-killstreak launcher, and Destroy a Sentry Gun.
Flak Jacket
- Less explosive damage.
Flak Jacket Pro: less explosive damage, no fire damage, and you can safely toss frag grenades back.
- Survive 10 explosions with Flack Jacket, plant or defuse 10 bombs playing Demolition, Search & Destroy, or Sabotage, and throw 5 enemy frag grenades back
Hardline
- Killstreak rewards take one less kill.
Hardline Pro: Killstreak rewards take one less kill and you can change what's in your care package.
- Share 10 care packages with teammates, earn 7 killstreaks in one match with Hardline, and Get 7 kills without dying in a single match.
Hardened
- Bullets penetrate thicker walls and objects.
Hardened Pro: Bullets penetrate even thicker walls and objects, increased damage on aircraft and turrets, and flinch less when shot.
- Penetration Kills: Get 10 kills using Hardened and shooting through walls.
- Bullets in Aircraft: Shoot 200 bullets into enemy aircraft.
- Equipment Shot: Destroy 1 piece of enemy equipment through a wall.
Scout
- Hold breath longer when sniper scoped.
Scout Pro: Hold breath longer when sniper scoped, and switch to weapons faster.
- Secondary Kills: Get 50 kills with secondary weapons.
- One Shot Kills: Get 50 "One Shot, One Kill" medals.
- Head shots: Get 30 head shot kills.
Steady Aim
- Increased accuracy when firing from the hip.
Steady Aim Pro: Increased accuracy when firing from the hip, recover quickly from knife lunges, and aim faster after sprinting
- Quick Melee: Melee two enemies consecutively within 5 seconds.
- Sprint Kills: Get 100 kills after sprinting.
- Hip Fire Kills: Get 150 hip fire kills using Steady Aim.
Sleight Of Hand:
- Reload your weapon faster.
Sleight Of Hand Pro: Reload your weapon faster, aim down sights quicker (Excludes Sniper).
- Aiming Kills: Get 150 kills while aiming down sights.
- Reload Kills: Kill an enemy within 5 seconds of reloading 30 times.
- Fast Hand Kills: Reload and finish off the enemy you wounded 10 times.
Warlord
- Attach two attachments to your primary weapon (excluding underbarrels).
Warlord Pro: Attach two attachments to your primary weapon (excluding underbarrels), and start with one lethal and extra tactical grenade, except Willy Pete
- Two Attachment Kills: Get 150 kills using a gun with two attachments.
- Grenade Kills: Get 10 Frag or Semtex kills.
- Grenade Multi-kills: Get 1 multi-kill with Frag or Semtex.
Tactical Mask
- Makes you resistant to Nova Gas.
Tactical Mask Pro: Makes you resistant to Nova Gas, and reduce the effects of Flash and Concussion grenades, reveals the position of a flashed or stunned enemy
- Flash Kills: Kill 20 enemies that are blinded by your Flashbang grenade.
- Concussion Kills: Kill 20 enemies that are stunned by your Concussion grenade.
- Nova Gas Kills: Kill 20 enemies poisoned by your Nova Gas.
Marathon
- Longer Sprint duration.
Marathon Pro: Sprint for an unlimited duration.
- 26 Miles: Sprint 26 miles using Marathon.
- First Blood: Get the "First Blood" medal 10 times.
- Captures: In Capture The Flag, get the "Flag Capture" medal 15 times while using Marathon.
Ninja
- Move silently.
Ninja Pro: Move silently, and make no noise at all and hear enemies louder
- Silenced Kills: Get 150 kills using the Suppressor attachment.
- Back Stabs: Get 5 "Backstabber" medals.
- Plants: Plant the bomb 10 times in Demolition, Sabotage, or Search & Destroy.
Second Chance
- Pull your pistol out before dying (Last stand).
Second Chance Pro: Pull your pistol out before dying, survive longer and ability to get revived by your teammates
- Kills: Get 10 kills while in Second Chance.
- Revenge: While in Second Chance, kill the enemy who downed you 5 times.
- Headshot: Get 1 headshot kill while in Second Chance.
Hacker
- Detect enemy equipment, turrets, and explosives.
Hacker Pro: Detect enemy equipment, turrets, and explosives, and sabotage enemy equipment and turrets, and booby trap stolen crates, and remain invisible to motion sensors.
- Destroys: Destroy 10 equipment or explosives while using Hacker.
- Explosive Kills: Kill 25 enemies with a Claymore or C4.
- Near Equipment Kills: Kill 25 enemies within the radius of your Jammer or Motion Sensor.
Killstreak bonuses
Get the indicated number of consecutive kills in Multiplayer mode to get the corresponding bonus.- RC-XD: 3 kills (remote control car that can explode)
- Spy Plane: 3 kills (Displays enemies on the mini-map. Spy Plane can be shot down.)
- Counter Spy Plane: 4 kills (Covers the opposing teams mini-map with static.)
- SAM Turret: 4 kills (airdrop a placeable SAM turret that shoots at enemy aircraft)
- Care Package: 5 kills (airdrop a random killstreak or ammo crate)
- Napalm Strike: 5 kills (airstrike a positionable Napalm)
- Mortar Team: 6 kills (select three locations to bombard with Mortar Strikes)
- Sentry Gun: 6 kills (airdrop a placeable Sentry Gun)
- Attack Helicopter: 7 kills (call in attack helicopter)
- Valkyrie Rockets: 7 kills (deploy remote controlled rockets)
- Blackbird: 8 kills (Displays both enemy direction and position on the mini-map; Blackbird cannot be shot down)
- Rolling Thunder: 8 kills (carpet bomb airstrike)
- Chopper Gunner: 9 kills (be the gunner of an attack helicopter)
- Attack Dogs: 11 kills (attack dogs that find & kill the enemy)
- Gunship: 11 kills (be the pilot an attack helicopter)