Drop 3 weighted chime balls down the interchangeable tracks of this oversized marble run building system. As balls race, spin, zig-zag, disappear & reappear, learn to predict the balls’ course. Experiment with different layout options. Can double as a castle playset for hours of imaginary play. Includes 8 pieces. Not compatible with Marbleworks® items. 25 x 14 ½ x 10" (63.5 x 36.8 x 25.4cm) assembled. dt exclusive. Multiple awards. 2 years+ Benefits: -Experiment with different construction possibilities & outcomes - Understand cause & effect and observe gravity in motion - Predict path the balls will take - Improve visual tracking - Explore positional concepts: in, out, on, under & through - Practice fine motor dexterity and coordination - Close the castle door & guess which ball will finish first - Large castle makes a great imaginary playset