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Left 4 Dead 2 (abbreviated as L4D2) is a cooperative first-person shooter video game. It is the sequel to Valve Corporation's award-winning Left 4 Dead. The game launched on November 17, 2009, for Microsoft Windows and Xbox 360 in the United States and November 20 in Europe; in 2010, Left 4 Dead 2 was made available to the Steam client for Mac OS X.[6] It builds upon the cooperatively-focused gameplay of the original and uses Valve's proprietary Source engine, the same game engine used in Left 4 Dead. The game made its world premiere at E3 2009 with a trailer during the Microsoft press event.[7]

Minimum:

Supported OS: Windows® 7 / Vista / Vista64 / XP
Processor: Pentium 4 3.0GHz
Memory: 1 GB for XP / 2GB for Vista
Graphics: DirectX 9 compatible video card with 128 MB, Shader model 2.0. ATI X800, NVidia 6600 or better
Hard Drive: At least 7.5 GB of free space
Sound Card: DirectX 9.0c compatible sound card
Recommended:

Supported OS: Windows® 7 / Vista / Vista64 / XP
Processor: Intel core 2 duo 2.4GHz
Memory: 1 GB for XP / 2GB for Vista
Graphics: DirectX 9 compatible video card with Shader model 3.0. NVidia 7600, ATI X1600 or better
Hard Drive: At least 7.5 GB of free space
Sound Card: DirectX 9.0c compatible sound card