. Kids can build using the easy-to-hold building blocks and double-sided learning blocks that feature instruments. Insert the 10 double-sided learning blocks into the interactive Smart Star and it will respond with educational songs and encouraging phrases about shapes and instruments that enhance building play with learning content. Build on the Smart Star cube to trigger sounds. Press the question button on the Smart Star to hear requests to find specific blocks in the set. The music button plays four learning songs and five melodies. Use the learning blocks from other LeapBuilders sets in the interactive cube to unlock additional content responses. Get building with smart blocks for smart kids.