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Design and engineer the tree house of your dreams with this one-of-a-kind building set. Use the included activity cards to complete engineering challenges. Build railings, platforms, trees, and then use your problem solving skills to re-engineer your design. Kids will love building their tree house—parents will love that they’re actually building critical thinking and STEM skills. Comes with 52 pieces, including activity cards. The platform measures 5.5” x 4.5” when built. For ages 5 and up.