Portal 1 and Portal 2... Problem in time is a mod for portal. And of course, there is a big problem in time!
GlaDOS you bad girl!!
No GLaDOS. Just a TTC (Time Travel Core)
Just? It is probably the smartest thing in the universe, and there is only one of them too.
What? You made a mod for Portal with time travel as a story element (as opposed to puzzle element as in CHRONOPORT) and managed to write the story completely avoiding GLaDOS?
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You might want to be careful about trying to escape Aperture Space, As it will give you the output of death.