HAPE QUADRILLA WOODEN MARBLE RUN CONSTRUCTION: CASTLE ESCAPE - 101 PIECES - Escape from the castle's rotary tower with this exciting Quadrilla set featuring two transparent stairways. As the marbles make their way down the rail they sound three hanging bells. Can you escape the castle's rotary tower? Watch the marbles twist and turn on castle escape marble run by Hape! Have marble run races with your friends and family! The Quadrilla castle escape is one of several types of marble runs in the Quadrilla line. There are endless possibilities for 3-D thinking and engineering development. Hape Quadrilla 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. Designed to engage kids in early STEAM development, The Quadrilla system encourages problem-solving and keeps little engineers coming back for more fun! The Quadrilla 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. Compatible with other Hape Quadrilla Marble Run, but is not compatible with Hape Marble Run E1100 E1101 E1102.