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Official Site: Activision

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 in combat in order to locate a numbers station. This station is due to transmit broadcasts to sleeper agent who are bound to use 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 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.

Development for the game began in 2009. It runs an enhanced version of the IW 3.0 engine used in World at War. The improvements made allowed for bigger campaign levels to be made as well as enhanced lighting. Treyarch focused specifically on Black Ops during development; they were developing two games at once while making World at War. Different teams within the company focused on a certain game mode. Music was composed by Sean Murray, with music by The Rolling Stones, Creedence Clearwater Revival, Eminem, and Avenged Sevenfold appearing in the game. The marketing of the game began in April 2010.

The game received generally positive reviews from critics with praise for its story, voice-acting, darker tone and multiplayer modes, although some criticized it for its lack of innovation, linear gameplay, and technical issues. Among other awards and nominations, Call of Duty: Black Ops was nominated Game of the Year by numerous media outlets and award shows, including the Interactive Achievement Awards, British Academy Games Awards, and Spike Video Game Awards. Within 24 hours of going on sale, the game had sold more than 5.6 million copies, breaking the record set by its predecessor Modern Warfare 2 by some 2.3 million copies. The game had sold over 25 million copies worldwide, making it one of the best-selling games of all time. A sequel, Call of Duty: Black Ops II, was released in 2012. Call of Duty: Black Ops Cold War, set between Black Ops and Black Ops II, was released in November 2020.

Alex Mason has not been a contender in any CBUB matches.