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The Half-Life game series is based in a science fiction alternative universe, and encompasses the Half-Life games (1, 2, the latter's episodic content, and Alyx) and Portal games (1, 2).
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How are Portal and "Black Mesa" related?
Both Black Mesa and Aperture Science are trying to develop portal technology, they are basically competitors.
Aperture Science develops the portal gun on the Borealis (a research ship, just one of t …