Run. Think. Shoot. Live. Source. Black Mesa is the Half-Life 2 total conversion of the original Half-Life game. Utilizing the Source engine and its endless array of possibilities and powers, Black Mesa will throw you into the world that started the Half-Life continuum and introduced Gordon Freeman to the world as a gun-toting, bullet-dodging Ph.D. in Theoretical Physics.
The best and most fully functional mod I have ever played. Fantastic graphics, stupendous AI, nostalgic re-imaginations, great sound quality and voice acting... Best mod EVER.