Young ninja warriors defend their headquarters from evil with the LEGO NINJAGO Ninja Vehicle Tree House Battle (71857) building toy for boys and girls ages 7 years old and up. This toy building set lets NINJAGO fans construct a 3-story tree house full of features and accessories, then stage epic battles between heroes and villains inspired by season 4 of the NINJAGO Dragons Rising TV show. Once their playset is constructed, builders can explore the tree house featuring a workshop, tearoom, terrace, swinging vine rope, trap that releases a rock, rotating bridge and stud shooter. This set includes 6 minifigures: ninja warriors Kai, Zane, dragon form Jay and Euphrasia, plus villains Acid Monster and Loyalist, inspiring hours of pretend play and adventure stories. Kids can also play with the motorcycle toy that has moving wheels, a saddle-cockpit and 2 stud shooters, or take to the sky with the helicopter toy that has an opening cockpit and rotating blades. Makes a fun birthday gift or anytime present for kids who love ninja toys and action-packed adventures. The LEGO Builder app includes digital tools that make it easy for kids to save sets, track progress and zoom in and rotate models using 3D instructions. Contains 642 pieces.