3D Wooden Puzzle Building Kit - Marble Night CityHighlights DIY MARBLE RUN MODEL KIT: Excellent 3D wooden puzzles. Build your own working roller coaster model made of sturdy plywood. Once finished, you can run marbles through it! OPERATION WAYS: With the crank of the handle, fire up the gears. There is a shunting device that will let the steel ball go into different tracks, each track brings endless fun. You will learn how the elaborate marble coaster mechanisms come alive. STEM EDUCATIONAL TOYS:
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