Gears of War 2 is a tactical third-person shooter video game developed by Epic Games and published by Microsoft Game Studios for Xbox 360. It is the sequel to Gears of War, and was announced by lead designer Cliff Bleszinski during the February 20, 2008 Game Developers Conference. The game uses a heavily upgraded version of the Unreal Engine 3. During E3 2008, a worldwide release date for the game was set for November 7, 2008. Since its release, Gears of War 2 has been received with critical acclaim,and in its opening weekend the game sold over two million units.