Quick Answer: Call of Duty 4: Modern Warfare is a 2007 first-person shooter game developed by Infinity Ward and published by Activision. It is the fourth main installment in the Call of Duty series. The game breaks away from the World War II setting of previous entries and is instead set in modern times. Developed over two years, Modern Warfare was released in November 2007 for the PlayStation 3, Xbox 360, and Microsoft Windows. A Wii port, developed by Treyarch and subtitled Reflex Edition, was released in 2009. It was followed by two sequels that continue the storyline: Modern Warfare 2 and Modern Warfare 3. The game was critically acclaimed, especially for its gameplay and storyline, winning numerous "Game of the Year" titles. It was the top-selling game worldwide in 2007, selling around seven million copies by January 2008 and almost sixteen million by November 2013.