Candidate Twelve is a BMS remake of Half-Life: Echoes, another Half-Life mod created by "Mr. Gnang". An unnamed scientist referred to as “Candidate Twelve” is forced to survive through the facility as they face unknown alien danger, while being stalked by two opposing interdimensional entities.
Another parking lot, fitting for a huge battle full of angry grunts.
I have a feeling that it doesn't work in source, sorry just doesn't.
wdym?
Black Mesa runs on a modified Source engine
Clearly, you don't know what you're talking about or how the source engine works in the first place.