
Next generation AI technology powers all non-player Survivor and zombie characters.

The team of four Survivors may be comprised of 1 to 4 human players, allowing for single player and multiplayer co-op games. The campaigns link together to tell the story of the Survivor's escape to safety. Each campaign has an over-riding team objective, and is comprised of five large maps. The Survivor Co-op Game Mode is played out across four sprawling campaigns, set in urban and rural environments. Set in a modern day survival-horror universe, the co-operative gameplay of L4D casts four "Survivors" in an epic struggle against hordes of swarming zombies and terrifying "Boss Infected" mutants.

Game Description: Left 4 Dead (L4D) is a new action title from Valve, creators of the Counter-Strike and Half-Life games, that promises to redefine the co-operative genre as those titles did for multiplayer and single player action games.
