Purchase this handcrafted wooden Marble Run set featuring a big waterwheel lifter to build your own intricate system of cogs, gears and wheels, and watch marbles racing down slides full of crazy twists and turns! This puzzle is full of elaborate mechanisms and small tricks with precise gear designs. Each gimmick creates dozens of actions that are fun to watch. Not only does this puzzle improve cognitive and motor capabilities, but it's also a brilliant way to enhance you or your child's understanding of STEM principles. It'll also put visual-spatial skills and patience to the test. The lightweight model is made of 294 natural pre laser-cut wood pieces with well-fit parts and stands at an outstanding 12.79 x 8.42 x 8.97 inches upon assembly. With no glue or additional tools required, this 3D puzzle set is the perfect gift for all ages and any occasion. Also serves as attractive and unique decor for your home or office.