Actually I started, I played 20 minutes, then I don’t recall what happened. Probably “the castle” came out. Then I forgot and played Blackwell Epiphany (very good).
I don’t know… a good puzzle is such a delicate thing, it must balance so many things and they all need to fit together to give you that “a-ha moment”. This kind of puzzle can never have two solutions. Unless the two solutions are basically the same solution (like: put a rat in the stew, or put an old shoe in it)