The sumo collection. Turns out wildsumo isn't too fascinating.
I'm not familiar with current popular sumo settings... the zones
here shrink like they did when I played sumo for a while.

Axis
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A central pillar for distraction.

Border
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Only a border strip is accessible.

ChronicDisease
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High rubber, no replenishing, large blast radius. Idea by Lunatic.

Claustrophobia
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Sumo in a box.

Hachisumo
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Six axes sumo.

Monosumo3
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Very large zone, very long tail.

Nanosumo
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I bet you can guess it.

Negativism
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The zone won't shrink, instead a deathzone grows from the center.

Pressure
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Similar idea as above, but the deathzones grow from the outside.

Rokusumo
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Eight axes sumo.

SumoForest
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Large zones, high speed, chico physics and a lot of obstacles.