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[ All New 3D Puzzle Model Kit] - The 294-pcs marble run 3D Wooden Puzzle Model Kit is inspired by Rube Goldberg Machine, aiming to watch marbles racing down slides full of crazy twists and turns through tricky & fun devices!

[ Multiple Ways to Play ] - This wood mechanical model kits for adults will bring you highly satisfying and educational user experience. Rotate the crank, steel marbles shall follow 3 different paths to achieve gravity fall. Every accidental or doomed choice of path will create dozens of fun to watch.

[ Elaborate Structure Design ] - This 3d puzzle for adults has Black-grey appearance, combined with metal silk-printed technology, retain the wood grain while giving it a metallic texture. Full of well-designed mechanisms and small tricks, like funnel type rotary acceleration device, swinging ball separator, etc.

[ Assembly Tips ] - Non-toxic and natural plywood sheets, together with illustrated English instructions, and necessary spare parts in case. Just be patient and after 7 hours you will make this 3d wooden puzzle for adults. We are willing to offer assistance when you meet problems.