same here I have nearly lost my brain think about the puzzle
I must have done it before, but can't rember how. I had to restart (twice) what a slog.
You select the correct number of buttons first R7 B8 Y9 G10, then flick the switches, I did then R, B, Y then G (don't know if that matters - probably not) you'll hear a crash of the crystals breaking, and you're in (phew).
