I intend to play some of the levels posted in here in the next few days (not right now, when I need to go to bed).
In the meantime, I made a fairly hard ghost house themed around the idea of rooms that are (mostly) mirror images of one another. It's up to you to figure out which things don't abide by the "mirror image" rule.
I've left some hints, so turn comments on if you need some clues (since it's fairly tough).
Ghostly Mirror Manor
18E0-0000-00A2-6A64