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Half Life.
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...aaaaaaaany day now.
I‘d say Portal, but I guess we’re in the same boat.
It seems we are left for dead game series ):
You could say Portal Revolution is the third game (it's free direct from Steam, and while not wildly unique it will still have you scratch your noodle until you realize how obvious it is).
So I vote Portal in that case.
See also portal reloaded for new portal concept in time (like that one level from titanfall 2)
I thought you guys were meming with reloaded and revolution playing off the matrix, but now it seems I have some gaming to do this week
I haven't played it, but doesn't Half Life: Alyx effectively qualify?
It kind of falls out of there, being released out of order, and being VR-exclusive.
I mean Half Life 2 itself could be considered a trilogy