KLUTZ Lego Gravity Drop Activity Kit

* Includes everything you need to build an 18-inch (45 cm) tall marble maze with wooden balls, LEGO Technic elements, and sturdy chipboard.
* The convertible pegboard tower allows you to customize and expand with up to 159 included LEGO elements.
* Includes 20+ different LEGO contraptions that interact on the gravity drop tower, plus 5 extra projects: 2 mini tower builds, a gravity labyrinth, and a grabber.