Unique marble run with marbles propelled by widening tracks Encourages spatial reasoning, creativity, engineering skills, problem-solving Tracks suspended by hollow stacking cubes Follow guided builds or invent your own structures! Starter set includes 1 catcher, 1 topper, 30 risers, 5 stainless steel marbles, 6 unique tracks All sets are fully compatible with each other - Collect them all! High-quality materials and construction - Lasting durability Ages: 8+

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