Available only from Hammacher Schlemmer, this is the circuit builder set that emphasizes STEM principles while allowing children to construct an electric maze from interconnected plastic blocks. Winner of a Parent Gold Award, the kit uses conductive pins integrated into the 42 multicolored pieces that connect to complete circuits powered by three AA batteries (required). The pieces build up to 85 different projects, including various maze challenges. A hand crank generator provides an alternate power source, and the included push-button switch, reed switch, lamp, LED, alarm, and more complete the circuits. With carrying case. Ages 8 and up.