• Boys and girls aged 6 and up will have a lot of fun building the LEGO Ninjago Nya Against the Mutation Monster Ball (71849) toy making set and portraying scenes from the 4th season of the Ninjago Rise of the Dragons TV series. After completing the construction of the model, the children can quickly rotate the toy ball by pressing the launcher's button and see if 2 pieces of elemental power pop up when it hits its target. This LEGO toy-building set, itself of small gameplay value, features 2 minifigures, including the evil Mutation Monster, who can ride inside the spinning top with Nya, the sword spear weapon accessory. Kids have fun playing the battle of good and evil for hours with these Ninjago characters. With detailed robots, vehicles, dragons, and temples in the LEGO Ninjago line of toy making sets and adventure toys, fans can bring the spectacular ninja action to life. Using the LEGO Builder app, children can safely build each playset, zoom in with easy-to-understand digital instructions, rotate in 3D, and track progress. The set contains 49 pieces.