The title adds melee combat to enable deeper co-operative gameplay, with items such as a chainsaw, frying pan, axe, baseball bat, and more.
Introducing the AI Director 2.0, L4D's dynamic gameplay 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 the players' performance. The result is a unique game session custom fitted to provide a satisfying and uniquely challenging experience each time the game is played.
Featuring new Survivors, boss zombies, weapons, and items, Left 4 Dead 2 offers a much larger game than the original with more co-operative campaigns, more Versus campaigns, and maps for Survival mode available at launch.
To run Left 4 Dead 2 on high graphics settings your PC will require at least a 0MB GeForce GT 230 / Radeon X800 XT with a Core 2 Duo E4600 2.4GHz or Athlon 64 X2 Dual Core 4200+ CPU. System memory required for Left 4 Dead 2 is 2 GB performance memory. To be able to run at all you will need at least 1 GB system memory. Your graphics card will need to be capable of running DirectX 9. Recommended needs around a 10 year old PC to run.