Escape the castle's rotating tower with this exciting Quadrilla set including two transparent stairs. As the marbles make their way down the rail, they sound three hanging bells. Playing Tips Start by building one of the examples shown on the box. Watch your marbles navigate the spiraling coils, blocks and transparent stairs and sound the bells as they race to the catcher below. Now use your imagination to build your own fantastic marble runs! Features • Marble track building toy made from sustainable wood and non-toxic water-based paint • Includes 15 distribution blocks, a rotating tower, 4 small curves, a large curve, a spiral twist, 6 height adjusters, 4 stabilization rings, 8 accelerators, 2 hole sealers, 2 transparent stairs, 3 bells, 3 universal clamps, 50 marbles and a catcher • The transparent stairs and bells add a new sight and sound to the Quadrilla experience • The catcher makes it easier to catch the marbles at the end of the race • Endless possibilities to change the layout. See attached guide • German-manufactured design inspired by the Da Vinci Circle • Helps develop spatial thinking and understanding of scientific, technological, engineering and mathematical (WTBW) principles • Recommended by The Wall Street Journal as the perfect toy to teach children to code • Can be combined with all Hape Quadrilla sets • Suitable for 4 years and older