Call of Duty: Black Ops is a 2010 first-person shooter video game. The game was developed by Treyarch, published by Activision, and released worldwide on November 9, 2010 for Microsoft Windows, PlayStation 3, Xbox 360, and Wii consoles, with a separate version for Nintendo DS developed by n-Space. Announced on April 30, 2010, the game is the seventh installment of the Call of Duty series. It is also the first to be set in the Cold War and the fifth to be set in World War II. It is the third in the series to be developed by Treyarch, and is the sequel to Call of Duty: World at War.