Quadrilla Double-Sided Spiral Twist Marble Run. 9-piece set.

Let the Quadrilla set spin twice with this awesome double-sided spiral twister. Both the hollow and convex sides feature spiral tracks that double the fun. Play tips: When the hollow side of the spiral twister is facing up, marbles roll from the arm into the outer ring and then quickly down to the center. With the convex side facing up, the rolling speed of the marbles is reversed. A marble placed in the center rolls quickly from the center to the outer ring and the arm. Features • Double-sided spiral twister • Both sides of the twister can be used, doubling the fun • Marbles roll inward on the hollow side and outward on the convex side • Set consists of one double-sided spiral twister, three wooden divider blocks, one hole stopper, one accelerator, two stabilizer rings and two height adjusters, eight marbles • Design developed in Germany inspired by the Da Vinci circles • Helps develop spatial thinking and the basics of science, technology, engineering, and mathematics (STEM) • Praised by The Wall Street Journal as the perfect toy to teach children how to code • Compatible with all Hape Quadrilla sets • For ages 4-99