Kubbercraft is running on Minecraft 1.21.8 with a pretty simple idea: almost anything goes. PvP, raiding, and griefing are allowed, so you can build, survive, or go full conquer mode depending on how you want to play.
There are only a few basic rules, and they're there to keep things fair. No pay-to-win, no unnecessary restrictions, just raw survival and chaos with a friendly community behind it. Hack clients are not allowed, so keep it clean.
Server has proximity chat too, which makes it even better if you want to talk, team up, or just cause trouble while other players can actually hear you nearby:)