LEGO NINJAGO Arin's Spinjitzu Battle Mech (71839) – Ninja Building Set for Kids 7+

Overview

Ignite mid-battle imagination with the LEGO NINJAGO Arin's Spinjitzu Battle Mech (71839). This towering, fully posable ninja mech stands just over 6.5 inches tall and is loaded with action-ready features: a rotating torso, articulated arms and legs, and twin massive sword accessories that invite dynamic showdown scenes. The chest cockpit opens to reveal the Arin minifigure, while a loyal Baby Riyu dragon companion adds a touch of whimsy to every skirmish. The included Spectral Dragonian Warrior minifigure steps into the arena for dramatic clashes, whether kids reenact Dragons Rising moments or craft all-new adventures.

What’s included

• 213 pieces to build a detailed, posable mech that can transform to suit play styles
• Arin minifigure with crystal katana sword for heroic action
• Baby Riyu dragon companion for extra charm and storytelling options
• Spectral Dragonian Warrior minifigure to stage epic battles
• Open chest cockpit at the center of the action for role-play moments
• Twin sword accessories to recreate signature ninja combat scenes

Play possibilities

• Recreate favorite Dragons Rising scenes or imagine new adventures with Arin leading the charge
• Mix and match components with other 2024 NINJAGO mechs (Cole, Sora, Kai, Lloyd) to build customized battle machines
• Experiment with different poses thanks to the movable torso, arms, and legs for dynamic action poses

Build, app guidance, and features

The LEGO Builder app provides kid-friendly, step-by-step instructions with interactive 3D viewing to help beginners and seasoned builders alike enjoy a smooth construction experience. Assembling this set offers a tactile building journey that supports creativity, focus, and storytelling, all while developing fine motor skills and spatial reasoning in a fun, screen-optional way.

Dimensions and notes

When assembled, Arin's Spinjitzu Battle Mech stands over 6.5 in. (16 cm) tall. The 213-piece count keeps the build engaging without being overwhelming, making it a solid gift idea for kids who love ninjas, robots, and imaginative play. Each component is designed for easy pickup-and-build sessions, whether solo or with friends, and the set is compatible with other mechs for endless customization possibilities.