
It builds upon cooperatively focused gameplay and Valve’s proprietary Source engine, the same game engine used in the original Left 4 Dead.

Serial Key Other new features include new types of Special Infected and an arsenal of melee weapons. Key Generator It is also the sequel to Left 4 Dead 2 Patch, it was first announced on June 1st, 2009 by Valve Corporation at Microsoft’s E3 2009 press conference. Moreover, Patch It was then made available to the public on November 3rd.
