I bought this 3D puzzle for my son and daughters. It's not hard to assemble, but we still spend a little bit time to put all pieces together. We all enjoy spending time together.
Wooden Roller Coaster Marble Run Puzzle - ROKR 3D Mechanical Model For Self-Crafting, Decoration, And Educational Gifting
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ROBOTIME 3D DIY Solar Car Puzzle Kit - Fun Arts and Crafts for Teens and Adults - Top Learning Toy and Birthday Gift (Curiosity Rover)
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Robotime 3D Wooden Craft Kit: Brain Teaser Games Mechanical Gears Set With Cog Coaster And Steel Balls - Best Building Toys For Kids
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