In-Game Cheats
Nightmare mode, Dead Ops Arcade 2 and a zombie trick.
In-game cheats for Call of Duty: Black Ops III.
1.Unlock Nightmare Mode (Without Beating the Campaign)
At the Data Vault, go above the emblems, hold all triggers simultaneously, then press Square and Triangle for a keypad. Enter Dreamland.
2.'Nightmares' and 90+ Cyber Fabrication Kits
At your Safehouse Data Vault, focus on the top-left icon. You won't see the cursor, but holding L + R trigger + X + Y brings up a secret keypad. Enter MANIFEST and view it at your Control Core. Return to the Data Vault and repeat with DREAMLAND; back at the main menu, 'Nightmares' is unlocked.
3.Dead Ops Arcade 2
Complete Campaign mission 2 'New World' to enter the safe house. Go to the Data Vault and press the hidden button in the top-left corner.
4.Zombies: +5 Rounds
In Zombies, the Shadowman appears at the start of the first round on the staircase directly ahead; every headshot gives +1,500 points and sends you ahead 5 rounds.