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An old series of maps that i kinda left aside for half-life 1.
Took a few screenshots and picked the best one for here.
Why does it say blackmesa? This is clearly gold-source engine.
No... it's the half-life 1 engine.
gold-source = gldsrc = what you call "hl1 engine"
:P
their intent was probably the fact that this takes place in black mesa
But Black Mesa appears in HL1, *******. :)