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Valve actually used those super portals in Portal 2 as well to link huge levels together seamlessly. Of course not this obvious. But the idea to make this thing was derived from the tech Valve developed for Portal 2. I actually remember a topic somewhere that talked about making a level like this where you'd be able to walk on the ceiling and stuff.
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They were going to have a fourth gel that enabled you to walk on walls. It was purple, and could be stuck onto boxes. They didn't use it because test players felt it was too disorientating.