Named Game of the Year by over 50 publications, Valve's début title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
After saving the world from the invasion of alien lifeforms, G. F. became part of special forces that take care of localizing and eliminating the rest of witnesses of the fateful research that had caused the invasion, infiltrates remaining infested buildings and recovers evidence of accident's origins. This amateur episode is for "patient HL players". I'd also appreciate any remark and criticism of this episode (it's my first.. 9 maps).