Left 4 Dead 2

Left 4 Dead 2 is the sequel to the best-selling and critically acclaimed co-operative multiplayer smash from Valve, creators of the Half-Life, Portal, Team Fortress and Counter-Strike game properties. The title adds melee combat to the award-winning L4D style of play, with items such as a chainsaw, frying pan, axe, baseball bat, and more. Introducing the AI Director 2.0, L4D's dynamic game play is taken to the next level by giving the Director the ability to procedurally change weather effects, world objects, and pathways in addition to tailoring the enemy population, effects, and sounds to match your performance. The result is a unique game session custom fitted to provide a satisfying and uniquely challenging experience each time the game is played.

 

 

 

Minimum system requirements

Processor : Intel Pentium 4 3.0GHz
Video Card : DirectX 9.0 compatible video card with 128 MB, Shader model 2.0. (NVidia 6600/ ATI X800 or better)
Memory : 1 GB for Windows XP / 2 GB for Windows Vista (Assume 2 GB for Windows 7)
Hard Disk : 7.5 GB of free hard drive space
Operating System : Microsoft Windows® XP / Vista / 7
Sound Card : DirectX 9.0c compatible sound card
Direct X : 9.0c
Installation : DVD ROM 

Recommended system requirements

Processor : Intel Core 2 Duo E4600 2.4GHz or better
Video Card : DirectX 9.0 compatible video card with Shader model 3.0 (NVidia 7600 / ATI X1600 or better)
Memory : 2 GB
Hard Disk : 7.5 GB of free hard drive space
Operating System : Microsoft Windows® XP / Vista / 7
Sound Card : DirectX 9.0c compatible sound card
Direct X : 9.0c
Installation : DVD ROM

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Update : 

Left 4 Dead 2 - Left Behind Campaign - 265 MB.
Source : Gamefront.com

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