I've made a new world! I actually made this for Carbonfest on Carbon Combat so it could be used during the Sumo event, but the world obviously also works here!
It's called Sumo Mania; here's a picture preview!
There is basically one very big platform very high up on which contestants can battle in a Sumo game, and there is an animated elevator that can carry you up there. There are also three platforms for the spectators hovering around the main Sumo platform.
To see more of this world, play this URL!