Call of Duty: World at War is a first-person shooter video game developed by Treyarch and published by Activision. It was released for Microsoft Windows, the PlayStation 3, Xbox 360, and Wii in November 2008. It is the fifth mainstream game of the Call of Duty series and returns the setting to World War II. The game is also the first title in the Black Ops story line. World at War received ports featuring different storyline versions, while remaining in the World War II setting, for the Nintendo DS and PlayStation 2. A Windows Mobile version was also made available by Glu Mobile.