This is one hell of an Easter egg.
Treyarch, the developer of Call of Duty: Black Ops III, has put a secret mode in the latest first-person shooter game. Treyarch has been putting a zombie co-op play mode in its Call of Duty games for a while. Zombies even make an appearance in the single-player campaign of Black Ops III.
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In the Nightmares mode, you can play the entire single-player campaign over again, but this time with different characters and a different narrative. The characters are zombies, and it’s taking place in the zombie apocalypse universe. If you really like single-player campaigns, this is a pretty huge treat, and it is separate from the zombies mode. Activision’s Call of Duty: Black Ops III debuts on Friday on the PlayStation 4, Xbox One, and PC.