[SP] The Circuit
Ah, of course! I was so close, damnit.
By "center room" I mean the one with the hand button that turns on the funnel. I had the laser puzzle solved and wanted to move on. I think what I did was placing one portal inside the center room and having the second one still inside the laser room. I went through and fell on the ground in the center room. Unfortunately, I had forgotten to bring the sphere along. But the laser room was not accessible anymore because in order to get up there I would have needed to place the portal that was still in there on the funnel in the center room.
Wow, this sounds complicated. I've made a video that probably helps more:
Probably it could be made so that the door that opens when the laser puzzle is solved doesn't close again to prevent this?
Thanks for the vid zivi! I'll certainly have to address this issue, I'd just to find a way to do it without changing the way that door closes.