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For what reason would you want multi arena?
Because I want to run it in a skywars server
The plugin wasn't made to work on servers running multiple gamemodes. Making it possible would pretty much require the plugin to be re-coded from scratch.
It'd be possible to make it only do stuff in a specified world, so that it could be used on servers running multiple gamemodes, though it still wouldn't support multiple arenas.
I plan on making AgarioMC support whitelisted worlds, but I have other things on my to-do list too.