Left 4 Dead is a
cooperative first-person shooter video game with
survival horror elements, developed by
Turtle Rock Studios and published by
Valve Corporation. The game uses Valve's proprietary
Source engine, and is available for
Microsoft Windows,
Xbox 360 and
Mac OS X. Development on the game was completed on November 13, 2008, and two versions were released digitally: A downloadable digital version, released on November 17, 2008, and a digital retail disc version, with a release date determined by region. The digital retail disc version was released in North America and Australia on November 18, 2008; and in Europe and Japan on November 21, 2008.