Black Mesa is a free, fan-made, total conversion remake of the original Half-Life, made in the Source engine.

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What stealth elements are in Black Mesa and how does the enemy AI detect the player?

I would like to know what stealth elements are in Black Mesa and how does the enemy AI detect the player. Specifically, I would like to know if: Can enemies detect by sound? Will weapon sounds ...
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What is the difference between Half Life: Source and the new Black Mesa?

With the recent release of Black Mesa everyone seems to be very excited, but what are the main differences between Black Mesa and Half Life: Source?
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Black Mesa achievements

What are the achievements in the new Half-Life 2 mod Black Mesa?