I have tried all suggestions for this puzzle and it is frustrating. I cannot get both lenses in at the same time, one or the other pops out, then when I move to the next telescope, the previous one looks like the colors have gone. I think I have all the blue colors to the outside and when I climb the walkway, they are colorless! I am using the mouse and ctrl on keyboard. Anyway of talking me thru this? (I really want to open that door!) Thanks, Kalygarr