Call of Duty: Black Ops is a first-person shooter video game developed by Treyarch and published by Activision to be released on November 9, 2010 for the Microsoft Windows operating systems, the Xbox 360, PlayStation 3, Wii, and Nintendo DS (separate version developed by n-Space) consoles. Officially announced on April 30, 2010, the game is the seventh installment of the Call of Duty series and the third game in the series to be developed by Treyarch. It is a sequel to the developer’s previous title in the series, Call of Duty: World at War. It is the first Call of Duty title set during the Cold War era.