Call of Duty 4: Modern Warfare is a first-person shooter developed by Infinity Ward and published by Activision . An installment in the Call of Duty series, it was released in November 2007 for the PlayStation 3, Xbox 360, and Microsoft Windows. The game breaks away from the World War II setting of previous entries in the series and is instead set in modern times. Developed for over two years, the game uses a proprietary game engine.