Wooden Waterwheel Mechanical Puzzle ToyToys nowadays come in various types and mechanisms. There are simple ones and there are those that are on the next level when it comes to mechanisms. This Wooden Waterwheel Toy belongs to the latter. It is a DIY marble run that will surely be enjoyed by your precocious kids. Features: A DIY marble runs with laser cut wooden pieces. Various structure designs to choose from. 4 hours of assembly time. Specifications: Size: 9. 92 x 9. 05 x 6. 49 inches.