A first-person puzzle game developed by Valve and graduates of DigiPen, Portal forces a human test subject to run a gauntlet of grueling spatial experiments administered by a malfunctioning, psychotic artificial intelligence named GLaDOS.
With them adding achievements and stuff to a game as old as Portal it suggests a viral campaign - probably for Portal 2. Portal was always part of the HL universe but if you mean a direct crossover with say EP3 - can't see it. Totally different in tone.
I think we all knew there'd be a crossover between the two universes (or rather, that Half-Life and Portal actually existed in the same universe) once they name-dropped Aperture Science in Episode 2.
Of course I'm guessing Portal 2 from this. I think the original ending is better thou. To connect things between Portal and hopfully a sequal is probably why they changed it. I'm just guessing here, of course...
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