It took me a while to figure it out and I'm not sure I completely do lately do but as I dug the tiles out after going through the color doors I had to play with the switches to get back in-and-out after placing the magnifying glass in glass I guess a lens on the switch color in the main Box. I ended up having to flip the switches many times going in-and-out the doors to get all the tiles. Don't know if it's helpful.
