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Isotope

This puzzle took us four months to create.
It might take you just as long to solve it.

Welcome, everyone, to this very special puzzle.
It was created over a long period of time by both Leomievs and myself.
Both of us had never collaborated on the creation of a puzzle before, but we think it turned out pretty well :]

We do not want to give away too much, but please mind the following:
- If you're having trouble figuring out where to start, follow the arrows.
- Pay close attention to the signage indicating which of the three cubes auto-respawns.
- No tight timing or tight angles, no glitches, no bunnyhopping, etc. All clean logical moves.
- Remember to use quicksave with F6 and quickload with F7.
- You can only place portals on the floor half panels when you're in line with them.
- Using a glitch where a cube passes through a light bridge is not intended.
- Waiting forever for things to magically happen is not intended.

Difficulty: 9/10.
Please let us know in the comments when you think you found something unintended.

Huge thanks to Libbybapa and Narkodes for making their custom items available to us!
Without them, this map may not have seen the light of day.

When you are done here, check out this video that explains the creation process of this map. The official intended solution begins at 22:32.
Good luck and have fun.

The background music is adapted from the track Endless River from my album Irrational Points.[mikeastro.bandcamp.com] Please consider checking it out!