Left 4 Dead From Valve (the creators of Counter-Strike, Half-Life and more) comes Left 4 Dead, a co-op action horror game for the PC and Xbox 360 that casts up to four players in an epic struggle for survival against swarming zombie hordes and terrifying mutant monsters. Set in the immediate aftermath of the zombie apocalypse, L4D's survival co-op mode lets you blast a path through the infected in four unique “movies,” guiding your survivors across the rooftops of an abandoned metropolis, through rural ghost towns and pitch-black forests in your quest to escape a devastated Ground Zero crawling with infected enemies. Each "movie" is comprised of five large maps, and can be played by one to four human players, with an emphasis on team-based strategy and objectives. New technology dubbed "the AI Director" is used to generate a unique gameplay experience every time you play. The Director tailors the frequency and ferocity of the zombie attacks to your performance, putting you in the middle of a fast-paced, but not overwhelming, Hollywood horror movie. Left 4 Dead 2 Set in the zombie apocalypse, Left 4 Dead 2 (L4D2) is the highly anticipated sequel to the award-winning Left 4 Dead, the #1 co-op game of 2008. This co-operative action horror FPS takes you and your friends through the cities, swamps and cemeteries of the Deep South, from Savannah to New Orleans across five expansive campaigns. You'll play as one of four new survivors armed with a wide and devastating array of classic and upgraded weapons. In addition to firearms, you'll also get a chance to take out some aggression on infected with a variety of carnage-creating melee weapons, from chainsaws to axes and even the deadly frying pan. You'll be putting these weapons to the test against (or playing as in Versus) three horrific and formidable new Special Infected. You'll also encounter five new uncommon common infected, including the terrifying Mudmen. Helping to take L4D's frantic, action-packed gameplay to the next level is AI Director 2.0. This improved Director has the ability to procedurally change the weather you'll fight through and the pathways you'll take, in addition to tailoring the enemy population, effects, and sounds to match your performance. L4D2 promises a satisfying and uniquely challenging experience every time the game is played, custom-fitted to your style of play. System Requirements Windows MINIMUM: OS: Windows® 7 32/64-bit / Vista 32/64 / XP Processor: Pentium 4 3.0GHz Memory: 2 GB RAM Graphics: Video card with 128 MB, Shader model 2.0. ATI X800, NVidia 6600 or better DirectX: Version 9.0c Storage: 13 GB available space Sound Card: DirectX 9.0c compatible sound card RECOMMENDED: OS: Windows® 7 32/64-bit / Vista 32/64 / XP Processor: Intel core 2 duo 2.4GHz Memory: 2 GB RAM Graphics: Video Card Shader model 3.0. NVidia 7600, ATI X1600 or better DirectX: Version 9.0c Storage: 13 GB available space Sound Card: DirectX 9.0c compatible sound card Mac OS X OS: MacOS X 10.6.4 or higher (Snow Leopard Graphics Update required) Processor: Dual core Intel processor, 2GHz or better Memory: 2 GB RAM Graphics: ATI Radeon 2400 or higher / NVIDIA 8600M or higher / Intel HD Graphics 3000 Storage: 13 GB available space Additional Notes: Not supported: OS X 10.5.x, ATI X1600 or X1900 graphics, NVIDIA GeForce 7 graphics or Intel graphics less than Intel HD 3000. SteamOS + Linux OS: Ubuntu 12.04 Processor: Dual core from Intel or AMD at 2.8 GHz Memory: 2 GB RAM Graphics: nVidia GeForce 8600/9600GT, ATI/AMD Radeon HD2600/3600 (Graphic Drivers: nVidia 310, AMD 12.11), OpenGL 2.1 Storage: 13 GB available space Sound Card: OpenAL Compatible Sound Card