Portal Tunneling
I went back and did 15 again and dagnabbit, you were right. I must have remembered it wrong. In that case, I guess portal tunnelling is an acceptable solution for a challenge version of a puzzle.
Really, anything you can think of is an acceptable solution.
Just because a technique wasn't taught in the game doesn't mean anything.
It says that the designers thought it was too complicated for the general public. They didn't want portal to be something you pull your hair out for hours trying to figure out.
Custom maps however...Custom maps shouldn't be limited by what the general public would be able to do. If you want to make a custom map that irritates the crap out of everybody because it's too difficult, go for it. Just give people fair warning that it's challenging.
For my next map, I'll make a puzzle that requires you to noclip to complete it.
....Well that would be a cheat.
I should rephrase what I said before...Anything you can think of is an acceptable solution. Provided you don't need to go into the console to do it.
Tunneling is the term commonly used for placing one portal on the ceiling, one portal on the ground, and achieving terminal velocity within a relativly small area.
actually, to my knowledge thats incorrect.
Tunneling has been coined for the method of putting 2 portals, both on walls, standing just barely inside one, shooting another one on another wall, and staying inside the portals still. its how you can get least portals on number 15 advanced. It allows you to move around corners without the use of the lifts in that level, because you're always standing in the portals on a paper thin piece of wall.
Er, no, tunnelling is the trick where you place a portal while standing in "the middle" of the portal already, and backing out before the portal projectile hits the target wall so that you're essentially "moving" one end of the portal further and further through the level while not actually moving yourself.
Ah, well that would be my mistake then.