 In Japan, ROBO-ONE has spawned a whole series of related competitions including ROBO-ONE J, ROBO-ONE Special, ROBO-ONE Grand Prix, and the ROBO-ONE Technical Conference events.ROBO-ONE type contests have been held in several other countries including South Korea (official) and the United States (unofficial held by Robogames).The robots are usually built with RC Servos as actuators and mounted together with sheet metal shapes.