Call of Duty 4: Modern Warfare is a first-person shooter video game, developed by Infinity Ward and published by Activision for the Xbox 360, PlayStation 3 and Wii video game consoles and the Microsoft Windows and Mac OS X operating systems. The game was released in North America, Australia, and Europe in November 2007 for video game consoles and Windows, was released for the Mac in September 2008 and was released for the Wii in November 2009, given the name Reflex Edition. It is the fourth installment in the Call of Duty video game series (excluding expansion packs), and is followed by a direct sequel, Call of Duty: Modern Warfare 2. The game breaks away from the World War II setting of previous games in the series and is instead set in modern times. Call of Duty 4 was in development for two years, and it uses a proprietary game engine.
The story takes place in a fictional near-future, where a radical leader has staged an execution order against the president of an unnamed country in the Middle East, and an “Ultranationalist” movement has instigated a civil war in Russia. The events of the conflicts are seen from the perspectives of a U.S. Reconnaissance Marine and a British SAS commando, and are set in multiple locations, including the Middle East, Azerbaijan, Russia, and Prypiat, Ukraine. The multiplayer portion of the game features various game modes, and contains a leveling system that allows the player to unlock additional weapons, weapon attachments, and camouflage schemes as they advance.