Trestle Tracks Builder Set

A truly mesmerizing marble-track experience!Each 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.   Unique marble run with marbles propelled by widening tracks Encourages spatial reasoning, creativity, engineering skills, problem-solving Tracks suspended by hollow stacking cubes Watching them go is like magic in slow-mo!  This 73-piece Builder set with four guided builds with easy instructions.  Ages 8+