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Robot-sumo, or pepe-sumo, is a sport in which two robots attempt to push each other out of a circle. The robots used in this competition are called sumobots.
The engineering challenges are for the robot to find its opponent and to push it out of the flat arena. A robot should also avoid leaving the arena, usually by means of a sensor that detects the edge.
The most common "weapon" used in a sumobot competition is an angled blade at the front of the robot, usually tilted at about a 45-degree angle towards the back of the robot. This blade has an adjustable height for different tactics.
Robot-sumo is divided into classes, fought on progressively smaller arenas: