Call of Duty is a computer/video game based on the Quake III Arena engine (id Tech 3), and was released on October 29, 2003. The game was developed by Infinity Ward and published by Activision. The game simulates the infantry and combined arms warfare of World War II. Call of Duty was accompanied in September 2004 by an expansion pack, Call of Duty: United Offensive, which was also produced by Activision, but developed by Gray Matter Interactive with contributions from Pi Studios. The game follows the American paratroopers, British paratroopers and the Red army. The Mac OS X version of the game 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 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 Valve's content delivery platform, Steam.
Freedom fighters is a shooter in the third person, where the player moves through the streets of New York while fighting Soviet forces. The game also contains basic elements, having a charisma meter. The player gains charisma by performing feats of the resistance movement against the invading forces, such as the capture of a base or destroying vital supplies. Charisma rather than won, teammates on the character can take, guerrilla leaders and Russian soldiers injured, up to a maximum of twelve.
Freedom fighters uses a simple method of controlling recruits in battle. In the game, the player can send recruits by giving them simple orders as "follow", "attack" and "defend", but in the majority of situations, take care of themselves. Given the terrain of the city of New York after the initial invasion, stations generally the resistance of its soldiers in positions covered such as craters and buildings.