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Duality

didn't use, flip panel button, gel or angled panel. cheers

The intended solution is to do what you said for solution 3, except you use the portals to reach the cube after you get into the upper section.

I can still solve it two ways without 1) using the first button in the first room or 2) sending any gel through a portal.

Solution 1:
I can still throw the cube up to this ledge above the first button that leads to the exit. I can still jump to this ledge using the same trick described below (it's even easier now).

Solution 2:
I can throw the cube up the the ledge between the two rooms and then use the angled platform to carry the cube up to the exit corridor. The orange gel already on the floor is needed for the speed leap through the angled platform.

Solution 3 (intended solution?):
Use the white gel to make a portalable wall in the first room. Then use portals to get the cube into the second room. Then use the angled platform while carrying the cube.

This third solution would make more sense if the first button turned ON the white gel rather than turned it OFF.

Okay, that should be an easy enough fix actually. Thank you for the tip!

I grabbed the cube and jumped up to place it on the ledge right above the first button. I then went up the stairs in the 2nd room and peeked through the upper doorway overlooking the first button and cube. I inched out as far as possible (without falling) and turned right 90 degrees and placed a portal near the ledge with the cube on it. The portal faced the button and faced the wall you use to enter. I then placed a portal in the far right corner of the second room behind the goo. I used the orange goo to run fast through the portals and jumped to the ledge where I placed the cube. The rest is self-explanitory. Trust me, it can be done.

Explain how, I'll try to fix that.

I was able to solve this WITHOUT:
1) using the button in the first room
2) sending any gel through any portal
3) using the angled panel in the scond room.