Call of Duty: World at War is a 2008 first-person shooter video game developed by Treyarch and published by Activision for Microsoft Windows, PlayStation 3, Wii, and Xbox 360. The game 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. The game was released in North America on November 11, 2008, and in Europe on November 14, 2008. A Windows Mobile version was also made available by Glu Mobile and different storyline versions for the Nintendo DS and PlayStation 2 were also produced, but remain in the World War II setting. The game is based on an enhanced version of the Call of Duty 4: Modern Warfare game engine developed by Infinity Ward with increased development on audio and visual effects.