I tried and quit and came back to "four rooms" again and again over the course of weeks. I kept coming back and today I finally got a solution that I believed would work: mirrors lined up to reflect the laser to the final switch with no doors in the way. I had it. PIC
And then I find out the laser can't cross itself. A situation I had never come across.
This is just pure evil.
I checked the hints and it says I need all the mirrors free to move and my broken solution has 2 irretrievable so I'm back to square one.
I won't let this level defeat me.