Sumo mod by MisterE for use with arena_lib (minigame_lib) You should be familiar with how to set up arena_lib arenas.
Code snippets from https://gitlab.com/zughy-friends-minetest/arena_lib/-/blob/master/DOCS.md and from Zughy's minigames
to set up an arena, create a confined space that floats in the air, with lava or other damage blocks beneath. Set the spawners on the platform. You can use mesecons to make the board more interesting.
In this game, each player gets a tool that pushes other players... the goal is to knock all other players off and be the last one standing. Each player has 3 lives