Not only can girls (and boys) design and build their own two-level structures, electrical circuits bring the creations to life, with spinning windmills, lamps, elevators and a whole lot more. This 131 piece set teaches important STEM skills including hands-on problem solving, spatial and fine motor skills, self-confidence and creativity. Compatible with all other Roominate products, this 131 piece set teaches important STEM skills: hands-on problem solving, spatial and fine motor skills, self-confidence, and creativity.