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【420pcs Brain Teaser Puzzle】Combining marble run with factory concept, the 3D puzzle provides endless fun with its LED signboard, lifter, conveyor, funnels, tracks, bell, robot seller, etc. Challenge your mind, and launch marbles to see how they travel all over the factory! 【Mechanical Engineering】Driven by gear trains, the 3D puzzle mechanical machince reveals principles of physics. A lifter delivers marbles up to the top. The marbles fall by gravity to different funnels and curves. After all the transportation they drop to a conveyor and are sent to a bustling "robot seller" behind the counter. So much fun to watch and play. 【High-Quality Playset】Made of sturdy plywood. No glue needed. The 3D puzzle is all connected by tenon and mortises. Precise paser-cut pieces are easy to pop out and fit well together. Step-by-step instruction shows clearly how to assemble. Patience is the key to successful construction. 【Family Project】The whole family enjoying together is the best time. ROKR 3D wooden puzzle not only introduces fundamentals of mechanics to people, but also enhances quality time between families. 【Unique Gift for All】The brain teaser will amaze everyone who sees it. LED light even make it a night light at dark.(Please prepare 2 pieces of 3V CR2032 lithium batteries for it). Perfect birthday gift, anniversy gift, Christmas gift or gift on any occasion. Cool gift to keep persons feel absorbed and proud. An Heirloom Toy Worth of Every Penny.
