Left 4 Dead

Left 4 Dead (abbreviated L4D) is an upcoming multiplayer co-operative survival horror FPS game developed by Turtle Rock Studios which is now part of Valve Corporation. The game has been built using Source engine and will be available on PC and Xbox 360. Certain Affinity is responsible for the Xbox 360 version of the game.

Left 4 Dead puts four human playable or AI controlled survivors of an apocalyptic pandemic against hordes of the Infected. Regular Infected are controlled by the game AI, while human players can control up to four mutated Boss Infected with special abilities. The goal of Left 4 Dead for the Survivors is to help each other make it through a level to safety. Infected players must cooperate to stop them.

The expected release date for Left 4 Dead is November 18th 2008 in the US, and November 21st in Europe. The game was first revealed in the Christmas 2006 publication of PC Gamer UK with a six-page article describing a playthrough at Valve's headquarters. A teaser was released with The Orange Box. The game was first playable at the Showdown 2007 LAN in San Jose and at QuakeCon 2007. A demo, initially released on 6 November, 2008 to people who pre-ordered the game, was released on 11 November, 2008.

Architecture of the game never changes from map to map, so players will learn their way around fairly quickly. The AI Director solves this problem by procedurally placing enemies and items so that drama is good and no game is ever the same.