More than just a marble track run, Rollipop is also an infant and toddler tracking toy. Youngsters use tracking for visual memory and visual perception as they learn to use their eyes to direct and coordinate their large muscle groups. Rollipop Advanced is designed to develop this crucial skill using weighted balls that roll down slower than gravity would dictate, creating the element of surprise and suspense. 5 weighted tracking balls are included. Winner of the Oppenheim Toy Portfolio, Best Toy Award.