UGEARS Wooden Marble Run 3D Puzzle - Wood Marble Run Adult Stepped Hoist with 3-Stepped Lift 3D Wooden Puzzles for Adults - DIY Crafts for Adults - Wooden Model Kits For Adults To Build - 355 Pcs. Expand Your Collection Marble Game: The 3D puzzles adult wooden puzzle works as a standalone or it can be connected to another UGEARS marble runs model kit set of the same or different designs Intriguing Mechanism: This fascinating construction 3-d puzzles adult craft kits features an ingenious 3-stepped alternating lift mechanism. You can watch the marbles make their cyclical journeys Build DIY Kit: Similar to all our wooden models to build for adults, you can create your own roller coaster alone or in good company. The UGEARS wooden model kits for adults has different fun tracks. Hours Of Creative Fun: It takes about 8 hours to build this 3D wooden puzzle for adults. This construction narble rush models to build adults kit has anadvancedlevel of complexity Mind-Blowing Gift: UGEARS mode