Call of Duty 4: Modern Warfare is a 2007 first-person shooter video game developed by Infinity Ward and published by Activision for Microsoft Windows, OS X, PlayStation 3, Xbox 360, and Wii. A handheld game was made for the Nintendo DS. The game was released in North America, Australia, and Europe in November 2007 for video game consoles and Microsoft Windows. It was released for OS X in September 2008, then released for the Wii in November 2009, given the subtitle Reflex Edition. It is the fourth installment in the Call of Duty video game series, excluding expansion packs, and is the first in the Modern Warfare line of the franchise, followed by a direct sequel, Call of Duty: Modern Warfare 2 as well as the first game in the series to have a Mature rating. The game breaks away from the World War II setting of previous games in the series and is instead set in modern times. Developed for over two years, the game uses a proprietary game engine. On September 10, 2009, it was published in Japan by Square Enix.