Fight together or die alone in Left 4 Dead, a single-player storyline and online multiplayer post-apocalyptic shooter from Valve Software and EA Games for the Microsoft Xbox 360.

One of the "lucky" few apparently immune to the sickness, you, unfortunately, are also trapped in a city crawling with thousands of the bloodthirsty Infected. Together with a handful of fellow Survivors, you must fight your way to safety or die alone.

A co-operative multiplayer action game from the makers of "Counter-Strike," Left 4 Dead is built atop the most advanced version of the Source Engine and introduces version 2 of Turtle Rock's artificial intelligence (A.I.) technology.

Left 4 Dead: Game of the Year Edition for Xbox 360 offers all the content of the original plus all the content ing in the "L4D 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.

Left 4 Dead is a survival action game from Valve that blends the social entertainment experience of multiplayer games such as Counter-Strike and Team Fortress with the dramatic narrative experience made popular in single player action game classics such as the Half-Life series of games. Set in the immediate aftermath of the long-awaited zombie apocalypse L4D's single player and co-op game modes are played out across four sprawling "Movies" set in a variety of urban and rural environments.

Each "Movie" has an over-riding team objective is prised of five large maps and may be played by 1 to 4 human players. New technology dubbed "the AI Director" is used to procedurally generate a different experience each time the game is played. Just as in Hollywood films the Director calls for new monsters sounds and action as it tailors the gameplay experience based upon the team's performance.

In Left 4 Dead's Vs. Mode players may play as a Survivor or as one of four types of "Boss Infected." Each of the "Boss Infected" possesses an exceptional mutant ability - such as a 50-foot tongue lasso (Smoker) or a giant belly full of explosive methane gas (Boomer) - instead of traditional firearms!