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.
Part 2 of 2. Instructions: Once part 1 and 2 have been downloaded rename the files to include this format blackmesa.zip.001 for part one and blackmesa.zip.002 for part 2. Extract and copy files into sourcemods/BMS in your steamapps directory.