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

Get your Quadrilla set spinning twice over with this awesome double-sided spiral twister. Both the concave and convex sides feature spiralling tracks that double the fun. Play Tips When the concave 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 quickly rolls 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 inwards on the concave side and outwards on the convex side • Set consists of one double-sided spiral twister, three wooden spacer blocks, one hole stopper, one accelerator, two stabilizer rings, two height adjusters, eight marbles • German-developed design inspired by 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 • Can be used with all Hape Quadrilla sets • For ages 4-99 years