Call of Duty is a first-person shooter video game based on the Quake III: Team Arena engine. This war game simulates the infantry and combined arms warfare of World War II. The game was published by Activision and developed by Infinity Ward. It was accompanied in September 2004 by an expansion pack, Call of Duty: United Offensive, which was produced by Activision, and developed by Gray Matter Interactive, with contributions from Pi Studios. The Mac OS X version of Call of Duty was ported by Aspyr Media. In late 2004, the N-Gage version was developed by Nokia 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 United Offensive expansion and soundtrack in the USA. In Europe the soundtrack is not included).
Since November 12, 2007, the game and its sequels have been available for purchase via Valve's content delivery platform, Steam.
Call of Duty is similar in theme and gameplay to Medal of Honor, and like the latter includes various single player campaigns and missions. However, unlike Medal of Honor, the war is seen not just from the viewpoint of an American soldier but also from the viewpoint of British and Soviet soldiers.
The game is somewhat unusual in that throughout the single-player mode, the player is joined by computer-controlled allies who range in quantity from two infantrymen (in some of the British missions) to an entire regiment of tanks (in the Soviet missions). The computer-controlled allies will support the actual player during the missions (notable in this is the AI's effectiveness compared to other games like Medal of Honor). They also further the game's goal of providing an immersive and realistic experience; that is, soldiers in World War II were usually part of a larger group, as opposed to the "lone wolf" seen in video games such as Wolfenstein 3D. However, there are some missions where the player is alone.
Call of Duty also featured "shellshock" (not to be confused with the psychological condition of the same name), where when the player is close to an explosion, his vision is blurred, the player and time moves slower, and sound is muffled.
This game reenacts the following battles:
- Battle of Normandy
- Battle of the Bulge
- Battle of Stalingrad
- Battle of Warsaw
- Battle of Berlin
- Special Operation on Eder Dam
- Special Operation on Bavarian Alps
- Special Operation on Siegfried Line