Contains Left 4 Dead and the Left 4 Dead Survival Pack

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

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.

Valve's next generation AI technology, allows for games of 1 to 8 players. Players can play as a Survivor or as one of four types of "Boss Infected," each of whom possess a unique mutant ability such as a 50-foot tongue lasso or a giant belly full of explosive methane gas.

The gameplay takes place across four massive campaigns. The "zombie" population of each mission is choreographed by an "AI Director" that monitors the human players' actions and creates a unique and dramatic experience for them on the fly.

Left 4 Dead Survival Pack:

The Left 4 Dead Survival Pack is a collection of new content for 2008's Multiplayer Game of the Year. Headlining the pack is the new 1 to 4 person game mode, Survival, that challenges players and teams to "survive" unremitting swarms of zombies on over 10 maps. Rounds are scored by length of survival, and times will be uploaded to leader boards. Also included in the Survival Pack are two additional Versus campaigns. Each campaign features 5 maps for additional play of the four-on-four multiplayer game that allows players to compete as Boss zombies Versus the human Survivors.