Call of Duty: Black Ops, abbreviated as CoD: BO or simply BO, is the seventh main Call of Duty game, the third main game of the series developed by Treyarch and the sequel to Call of Duty: World at War. The game was published by Activision and for PC, Xbox 360, PlayStation 3, and the Nintendo Wii. Officially announced on April 30, 2010, the game was released on November 9, 2010.
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The game is set in the Cold War era. Much of the Call of Duty: Black Ops campaign is told through the eyes of SOG and CIA operative Alex Mason, primarily through flashbacks. Mason is asked questions by an unknown interrogator about a numbers broadcast which is being used to contact Soviet sleeper cells in the United States. These questions set the stage for the campaign missions.
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