Robofest RoboSumo 2008

About RoboSumo

Objective of RoboSumo is simple: Push the other robot out of the Sumo ring.

Robot Sumo is now the most popular robot competition worldwide.

Robofest Age Divisions


  Junior Division Senior Division
Sumo ring diameter 77 cm (30 inches) 122 cm (48 in)
Maximum robot mass 1kg (2.2 lbs) 2 kg (4.4 lbs)
Maximum robot width and length 23 cm (9.0 inches) 30 cm (11.75 inches)
Maximum robot height no limit 30 cm
Robot type Lego Mindstorms RCX or NXT only. any

Sumo Ring

The Sumo ring is made of flat black painted plywood or MDF board. There is a 5 cm wide white painted border. Recommended height from the floor is around 5cm. A detailed instruction, though the spec is slightly different from that of Robofest RoboSumo, can be found on the web at:

Example Robo sumo ring for Sr. division

Robot Construction

The robots must be totally autonomous (computer brains on board) meaning, no remote control or human intervention of any kind, and no tethered, IR, or RF connection to a host computer. You may use any number of motors. You may use any type/number of sensors.

Sumo Match Rules

A match consists of up to three games. The first robot to win two games wins the match. Game Rules


Last updated: January 21th, 2008

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