You might have noticed that the Nightmares Mode is not available from the start of the game. This despite that the regular Zombies Mode is in the Main Menu from the start.
To unlock Zombie Nightmares Mode, you’ll need to do the following:
• You unlock Nightmares by completing the normal Single Player Campaign’s 11 missions. This can be done on any difficulty level.
• After the ending cinematic and credits have rolled, the new Nightmares Mode will appear in the Main Menu below Freerun Mode.
• Once unlocked, Nightmares Mode allows you to replay the Single Player Campaign, but from a different (Zombies) perspective.
This video shows how to unlock the “Nightmares” Black Ops 3 Zombies Campaign Mode:
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Credits: Special thanks to TmarTn for the tips.