All-new kits inspired by our award-winning STEM products! Discover the marble mayhem of our Toy of the Year Award-winning Tumble Tax with this introductory marble run set. Using the set’s cling-back pieces, build tracks on walls and windows to solve STEM challenges! No permanent adhesive required!! Includes 13 track pieces, 2 balls, and double-sided challenge cards.
Age: 5 years+