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and later released worldwide on December 14, 2011.

The game features the same gameplay mechanics as its predecessor, with players fighting off waves of zombies as they try to survive for as long as possible. The game also includes a new storyline set in a Cold War-era Pentagon, with the characters from the original Zombies mode returning to fight off the undead.

The game allows for up to four players to play together via Bluetooth or Wi-Fi, and also includes a single-player mode with a new leaderboard system to track high scores.

Call of Duty: Black Ops – Zombies received mixed reviews upon release, with critics praising the game's addictive gameplay and multiplayer functionality, but criticizing the graphics and lack of content compared to the console versions of the game. Despite this, the game was a commercial success, with over a million downloads in its first week of release.