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Beat Call of Duty: Black Ops 3 campaign to unlock this secret mode

Treyarch: "It's part of our studio's DNA to launch a game with a few surprises."

As it turns out, Call of Duty: Black Ops III has yet another game mode. Once you beat the campaign, you'll have the option to play it again, but this time with zombies. This new mode is, appropriately enough, called "Nightmares" and features something of a new storyline and of course zombies to kill.

You can watch a trailer for Nightmares mode above. It features the song "Nightmare" by frequent Treyarch collaborator Avenged Sevenfold, which also wrote an original song for Black Ops III.

"It's part of our studio's DNA to launch a game with a few surprises," Treyarch said.

Nightmares is Black Ops III's fourth main mode, following regular campaign, multiplayer, and Zombies. It also features a secret mini-game called Dead Ops Arcade 2.

For more on Black Ops III -- which launched on Friday, November 6 -- check out GameSpot's review and what other critics are saying.