In the early competitions ROBO-ONE, there was always a "Rumble" competition featuring the top robots trying to beat each other quite out of the ring. It was a robot version of "King of the Hill" and "Last Man Standing," and it was always a lot of fun.

Somewhere around 10 ROBO-ONE, the Rumble was removed from the range. But, fortunately, it is still a key element in the contest as independent Wonderful Robot Carnival. Last weekend, at the 4th Wonderful Robot Carnival, 40 + robots participated in the Rumble, even though they were divided into 4 groups individual because it would have been total chaos if they all tried to address both.