Call of Duty 4: Modern Warfare is a first-person shooter video game, developed by Infinity Ward and published by Activision for the Microsoft Windows and Mac OS X personal computers and the Xbox 360, PlayStation 3 and Wii video game consoles. 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. 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 a coup d'état in the Middle East, and an "Ultranationalist" movement has instigated a civil war in Russia