Project GeniusProject Genius Constantin Double Trouble Wooden Puzzle – Dual Maze Brainteaser with Synchronized Gears, Ideal Collector’s Gift, Adults & Teens 14+

I got this for my puzzle-loving mathematician husband and two months later he hasn't solved it. I don't know what that says about difficulty, but it looks very cool on a shelf too.

Bought this for my 15-year-old grandson who figured out how to release the ball bearings in about 10 minutes. Was hoping it would challenge him for a bit longer, but he had fun and he likes the way the puzzle looks. He promised to show his younger sister how to solve it.

Quality build, liked that it came with extra ball bearings. It was a great gift for my significant other as he likes challenges and puzzles.

Wood was a bit rough. Over all cool content.

Love this designers puzzles. They are beautiul and challenging.

Fascinating toy for an older child or adult. It was well received and enjoyed. Thanks!

The two rotating parts on my puzzle were each fastened to the wrong axle, making it impossible to solve. I played with the trapped marbles for almost an hour before noticing that my puzzle didn't match the picture on the box. I'm sure it could be taken apart and the parts swapped over, but I opted for a refund. Was a shame because this is a beautifully intricate puzzle, and a joy to move around.

I enjoyed it. Didn't take me long to figure it out!