How To: Unlock and play Zork in Call of Duty: Black Ops

Unlock and play Zork in Call of Duty: Black Ops

Earn the secret "Eaten by a Grue" achievement in the single-player campaign mode of Call of Duty: Black Ops with this gamer's guide! In order to unlock this achievement, you will need to break free from your chair and play Zork on the nearby computer terminal.

Call of Duty 7 (COD: BO) is the seventh installment in Activision's popular Call of Duty series of military-themed first-person shooter video games and the first to be set during the Cold War. COD7 is available for the PC, Xbox 360, PlayStation 3 (PS3) and Nintendo Wii.

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