This one feels different from other test chambers. Only 3 pairs of portals are actually needed to complete it.

Tips (POSSIBLY SPOILER-RIDDEN):
Keep the reflecting cube with you until you use it for a square-shaped button. And look around if you're stuck.

I feel like I'm losing my mind.

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After i solved the first puzzle, the door to the end was open and i could enter. Why is there another confusing maze with buttons on the wall and the ceiling that nobody needs to use?