Aspiring ninjas spin into action with the LEGO NINJAGO Nya vs. Mutation Monster Spinner (71849) building toy for boys and girls ages 6 years old and up. Builders are placed in the center of the action as they build their playset and practice Spinjitzu techniques or recreate scenes from season 4 of the NINJAGO Dragons Rising TV show. Once their build is complete, kids push the launcher's button to send the spinner toy into a quick spin and watch the 2 elemental power parts fly off when it hits its target. This set includes 2 minifigures: Nya with a glaive weapon accessory and the villainous Mutation Monster, who can ride inside the spinner, inspiring hours of pretend play good vs. evil battles. Makes a fun birthday gift or anytime present for kids who love ninja action and adventure toys. The LEGO Builder app provides easy-to-follow instructions where kids can save sets, track progress, and zoom in to rotate models in 3D while building. Contains 49 pieces.