Left 4 Dead (L4D) is a new action title from Valve, creator 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. 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. The Survivor Co-op Game Mode is played out across four sprawling campaigns, set in urban and rural environments. Advanced AI drives both friendly and unfriendly creatures to dynamically create intense single player, co-op and multiplayer experiences every time the game is played. Play as a Survivor or as one of four types of "Boss Infected - each with an exceptional mutant ability, such as a 50-foot tongue lasso or a giant belly full of explosive methane gas instead of traditional firearms. For 1+ Players. Rated M = Mature. Model # 197110. Microsoft Windows XP Home Minimum System Requirements Processor PENTIUM 4 3.0Ghz 1024MB Memory 7.50GB Hard disk Keyboard Mouse DVD Sound Card Video Card128MB Direct X 9.0C Note: VISTA Compatible.