This is one of the most satisfying kits I’ve ever built, and the Sumovore it creates will be eligible for official RoboGames Mini-Sumo competitions, in which robots vie to push each other out of the ring.

This is not a project for beginners, but thanks to clear documentation and well-organized components, anyone with moderate soldering skills and sufficient patience shouldn’t have much trouble. It ships with analog “discrete brain” circuitry, but “brainboard” kits let you add popular microcontrollers.