Marble Climber Fortress Marble Run MR-2 3D Wooden Puzzle

DIYative™ Marble Climber Fortress Marble Run is based on great human engineering. Its design combines the beauty of physics, science, and machines, involving so many small gadgets and parts. Build this amazing marble run 3D wooden puzzle set and crank the handle, watch marbles run crazy down the slopes and twisting turns. Have fun! Perfect Marble Run DIY - This ROKR wooden puzzle is made of sturdy plywood. Once assembled, turn the crank, and watch the steel marbles run crazy down the tracks, much like a roller coaster ride. Loads of fun to play with family & kids. MECHANICAL CHARM - The building model kit uses gear trains, cams, ratchets, and cranks to make the mini-machines move. Laser-cut wood is durable with a smooth surface. Every part fits well together. No tools or glue are required.