DIY MARBLE RUN MODEL KIT: Excellent 3D wooden puzzles. Build your own working roller coaster model made of sturdy plywood. After 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: This ROKR wooden puzzle can also be a brain teaser puzzle. It's a highly educational construction experience that satisfied you. Improve your understanding of STEM principles while having a whale of a good time. NO ADDITIONAL TOOLS REQUIRED: Everything you need to assemble the building kit comes in the box. Simply unbox and start! No additional tools or glue is required. WONDERFUL GIFT: It is an ideal and creative gift to surprise friends, families, Birthdays, and Christmas.A good choice for someone who is a DIY lover. It looks great and pretty to show on your table, showcase make your home more beautiful.