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.
This is a multi-player model for Half-Life. Just extract the zip to your Steam directory. Ex: C:\Steam\steamapps\*\half-life\valve\models\