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As a kid, I enjoyed playing with the Perplexus marble mazes. As I got older, I wanted more of a challenge. The other day I was scrolling on Instagram and came across this ad by a company called Intrism. They make <a href="https://intrism.com/collections/intrism-3d-wooden-puzzles">; wooden 3d puzzles</a> that turn into mind-bending mazes. I'm curious to see if anyone has built any of their puzzles? They have good reviews, I'm putting it on my wishlist!