Unlock Nightmare mode Without beating campaign
When in the Data vault go to the Data Vault Symbol, and hold Left Trigger(L2), Right Trigger(R2), Left Bumper(L1), Right Bumper(R1), Square, and Triangle. This will open a Secret code menu, there are many codes below. These will only be able to be used once. Enjoy!
Effect Code Gives the player 80 fabrication kits MANIFEST Unlocks nightmare mode DREAMLAND
Extra Custom Class Slots
Unlockable How to Unlock 10th Class Slot Reach 'Prestige 5' 6th Class Slot Reach 'Prestige 1' 7th Class Slot Reach 'Prestige 2' 8th Class Slot Reach 'Prestige 3' 9th Class Slot Reach 'Prestige 4'
Contributed By: Revenant_Sith.
Dead Ops Arcade 2
To access Dead Ops 2, go to the campaign screen and access your safe house. When in your safe house, go to your Data Vault. Move you selection to the top left corner, next to where it says "Data Vault" to what is a small icon. Select this icon, and you are taken to Dead Ops Arcade 2.
Contributed By: los_angeles818.
Zombie Mode +5 rounds
At the start of the first round in Zombies, the Shadowman appears on the staircase directly ahead and above. Every headshot gives you +1500 points and sends you ahead 5 rounds
Contributed By: SuprKidd.
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