Call of Duty: Black Ops is a 2010 first-person shooter game developed by Treyarch and published by Activision. It was released worldwide in November 2010 for Microsoft Windows, the PlayStation 3, Wii, and Xbox 360, with a separate version for Nintendo DS developed by n-Space. Aspyr later released the game for OS X in September 2012. It is the seventh title in the Call of Duty series and the sequel to Call of Duty: World at War.

Set in the 1960s during the Cold War, the game's campaign follows CIA operative Alex Mason as he attempts to recall certain memories of combat to locate a numbers station. This station is due to transmit broadcasts to sleeper agents instructing them to deploy chemical weapons across the United States. Mason and CIA operative Jason Hudson are the game's main playable characters, as well as Red Army soldier Viktor Reznov in one mission. Locations featured in the game include Cuba, Laos, Vietnam, the Soviet Union, the United States, Hong Kong, and the Arctic Circle. The multiplayer component of Black Ops features multiple objective-based game modes that are playable on 14 different maps included with the game. Improvements to loadout options and killstreak rewards are made. A form of virtual currency, COD Points, allows players to purchase weapons and customization options for their in-game character, as well as attachments and customization options for their weapon.

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