The LEGO Super Mario Bowser’s Muscle Car Expansion Set (458 pieces) lets kids engage in interactive role-play with a brick-built Bowser figure. The car features an Action Tag for digital play compatibility with LEGO Mario, Luigi, or Peach figures (sold separately). When Bowser is placed in the driver’s seat, pulling the yellow lever moves the hood ornament or launches bombs from the trunk. The set triggers sound effects like engine revving, horn beeping, and tire squealing while earning digital coins. Designed for ages 8+, this set requires one of the starter sets (71439, 71440, or 71441) for full interactive play. The LEGO Super Mario app provides building instructions and creative ideas, with device compatibility details available on LEGO.com/devicecheck. The set encourages solo or group play, combining physical building with digital challenges and expansion possibilities.