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 ported the game to OS X in September 2012. It is the seventh title in the Call of Duty series and a sequel to Call of Duty: World at War.

Call of Duty: World at War is a 2008 first-person shooter game developed by Treyarch and published by Activision. It is the fifth main installment of the Call of Duty series and is the fourth entry in the series to be set during World War II. The game was announced by Activision in June 2008 and was released in November 2008, for PlayStation 3, Windows, Xbox 360, and Wii. Other games under the World at War title were published for the Nintendo DS and PlayStation 2, featuring different storylines and missions.