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.

The PC version of the game will be playable by the press and public at a series of upcoming events including Leipzig Games Convention, (Germany), Festival du Jeu Video (France), and PC Gamer Showdown (UK). The worldwide debut of the Xbox 360 version will be at the upcoming Penny Arcade Expo (PAX) in Seattle, WA. Members of the development team will be on hand at each event to provide information and give away some Left 4 Dead memorabilia.

"The shared experience of Left 4 Dead is unlike that of any other action game," said Gabe Newell, president and co-founder of Valve. "That's what we've experienced playing the game, and from showing the game to the press and our partners. It sounds cliche, but in many ways you have to play this one to truly appreciate what we're attempting. So, to give gamers a chance to sample this new type of experience first hand, we're taking Left 4 Dead on the road."

Release Date: November 4, 2008