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.
(2 maps) You are Gordon "Rambo" Freeman, and your mission this time is to kill everyone in a secret base in the desert. Your equipment has been dropped near your start point, get it and infiltrate the base then get your transport home.
That mod is brutal. Expect to die often if you don't strafe.