Amazon.co.jp: Competitive MindstormsTM: A Complete Guide to Robotic Sumo using Lego® MindstormsTM: A Complete Guide to Robotic Sumo using LEGO MINDSTORMS : Perdue, David: Foreign Language Books
Lego Mindstorm Sumo Robot
LEGO MOC EV3 Flipper Sumobot/ Battlebot by DLuders | Rebrickable - Build with LEGO