Left 4 Dead

Left 4 Dead (abbreviated L4D) is a multiplayer co-operative survival horror FPS game developed by Valve Corporation. The game has been built using Source engine and is available on PC and Xbox 360.

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.

Left 4 Dead was released on November 18th 2008 in the United States, and will be released 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 November 6, 2008 to people who pre-ordered the game, was released on November 11, 2008.

The gameplay never changes from map to map, so players will learn their way around fairly quickly. The Director solves this problem by procedurally placing enemies and items to ensure variety and drama.

The Survivors
There are four playable human characters in the game. Every survivor has his or her unique appearance, personality and background.