Fat Brain Toys Fat Brain Toys Trestle Tracks Builder Set - 73-Piece Modular Marble Run, Ages 8+

A truly mesmerizing marble-track experience! This set is made up of hollow stacking cubes and a variety of perfectly flat tracks. The paths cut out of each track widen almost imperceptibly from one end to the other, creating an invisible slope that propels the marbles forward. Watching them go is like magic in slow-mo! Explore more with the 73-piece Builder set with four guided builds.

• A unique, open-ended marble-run building experience; Watching them go is like magic in slow-mo!
• The paths cut out of each track widen gradually to propel the marbles forward with mesmerizing grace
• Great for ages 8 and up; High-quality materials and design - pieces fit easily into place
• Encourages spatial reasoning, creativity, engineering skills, problem-solving, and critical thinking
• Choose the 43-piece, 73-piece, or 124-piece set; All sets are fully compatible with each other