Call of DutyMain article:
is a video game based on the , and was released on October 29, 2003. The game was developed by and published by . The game simulates the and warfare of. An expansion pack, , was developed by with contributions from and produced by Activision. The game follows American paratroopers, British paratroopers and the Red Army. The version of the game was ported by . In late 2004, the version was developed by and published by Activision. Other versions were released for PC, including Collector's Edition (with soundtrack and strategy guide), Game of the Year Edition (includes game updates), and the Deluxe Edition (which contains the United Offensive expansion and soundtrack; in Europe the soundtrack was not included). On September 22, 2006, Call of Duty: War Chest was released for PC, collecting Call of Duty, United Offensive, and Call of Duty 2. Since November 12, 2007, Call of Duty and its sequels have been available for purchase via 's content delivery platform .
