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.
This is a must play game! Honestly if you love the Half Life series then you really need to play this amazing homage. This game is nearly flawless. I don't think I could find a better remake. This is one of those rare gems that amazes me how well the Half Life moding community is.