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!
|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’|
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.
Zombie Mode +5 rounds (Call of Duty: Black Ops 3 Cheats)
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