Uncover the hidden connections between Aperture Science and the Half-Life universe.
In the events of Portal, Chell actually couldn't make it in the escape sequence and we find her in one of the original test chambers during the escape sequence. Which makes us realize that there are multiple clones of these chambers with minimal modifications...
You are Marc, a new test subject. Or so you think. The facility recognizes you, and the chambers have changed—almost like they're watching you adapt.
He's not just a Half-Life relic. The G-Man has appeared deep within Aperture, silently observing. Why is he here? What does he want from you? You don't know... But he is watching you...
All lore can change before the release.