I spent 3 hours one night, and 8 another night. After that, I put it in my "maybe later" category.
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Actually, there are some "trap" doorways that when you go through, put you somewhere else in the maze and block the path back. I don't know if those change or are always set. Considering I triggered one south of my purple rune room, and avoided that pathway and never found it again, it is probably set.