The best question about #black opps posted at Cacke$Cookies A/Q platform.
What engine does black mesa use?
Answer:
As Black Mesa is built on the Source engine, it itself is also moddable with support for Steam Workshop, and several projects have been started to create versions of Half-Life
Half-Life
Half-Life 2 is a 2004 first-person shooter (FPS) game developed by Valve. It was published by Valve through its distribution service Steam. Like the original Half-Life (1998), Half-Life 2 combines shooting, puzzles, and storytelling, and adds features such as vehicles and physics-based gameplay.
https://en.wikipedia.org › wiki › Half-Life_2
Half-Life 2 - Wikipedia
mods and expansions within Black Mesa.