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Ha, quite funny solution!

Cool trick

You were insanely good despite playing with a controller, though ! ;)

About what you reply to me : It's true that when placing again the orange portal, it's not in the same direction... But I suppose I now understand what was muddling my mind. It is that if the blue portal is looking north, then the orange one is looking south, so I would have expected to look north before entering the blue portal, but looking south after coming out of the orange one, except we're actually still looking north. Can't explain in detail here due to the character limit, but I would say it's either a bug, a mistake, or purposely done like that to make it easier to apprehend for players.

@jandlml: Well done!
@Azkunki: Thanks for your comment too. You just need to spot the place where you fall and reverse the direction of the portal ;)

thats ok. i watch the video to see how to do some of it but its great when i actually am able to do it.

Please don't play those old test chambers ... you can watch the video walkthrough, it's 'easy' ;D
I was still playing with a controller :O
Thanks.

i cant believe i did it. took me many tries but who cares yay!

(by the way, I've done something like that on my map "May the Glitch be with you" (#08), for a part dedicated to bunny hoping. But that's not real bunny hoping since you don't need to gather the speed yourself, you only need to keep the speed for one jump, just like here)

I don't understand why it is so much easier by doing it like in your video (I success easily half of the time). The way I tried to do it was by placing a blue portal on the 45° panel, jumping in the little hole through orange portal, then placing a portal where I was about to land. But by doing so, even when landing after the first pool of goo, I couldn't get past the second one (despite placing my last portal exactly at the same place than with the expected way. It seemed pretty much random anyway).

I even did it the expected way by using the very portal I placed after trying "my own way". Even so, according to my tests, it doesn't seem to be due to the first orange portal I place either.
I... don't understand.

im not even gonna try lol