About this item.The quadrille series games by Hape are award winning - recognized by the International toy industry with awards such as the Spiel gut (good toy) Award and Oppenheim toy Portfolio Platinum award winner this game is sure to entertain.Supports S. T. E. M learning - watch your child develop their imagination, problem solving skills, counting, color identification and more while playing while escaping the castle walls ..Prepare your child for the future - quadrille marble runs help children to develop spatial and reasoning abilities, and has even been highlighted as a developmental tool for computer programming by the wall street journal!.Massive 102 piece set is interchangeable with other sets - quadrille components are fully interchangeable among sets and Use Standard 5" Or 16mm marbles. Escape from this castle's rotary tower with exciting quadrille set featuring two transparent stairways. As the marbles make their way down the rail they sound three hanging bells while they are on their journey..Made from a renewable resource - you want the very best for your child and Hape delivers! Our toys provide hours of endless entertainment while using non-toxic, renewable materials that can also be recycled! The toy is and safe for your child!