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1
The U&U puzzle contains two U-shaped bolts and four nuts and it is quite complex to solve. There is a devious trick hidden in the puzzle. Taking a closer look at each part is the key to unlocking them. The U&U puzzle was designed by...
Reviews
5.0
1 rating
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U&U Cast Metal Puzzle
I have given two of these puzzles to friends because they are a great challenge and fun sharing with others. This puzzle is one of the best.