Cheating
From Minetest
Cheating means misusing features or exploits in the client, mods, or games, in an unintended way to have an advantage over other players.
What is considered cheating and what isn't varies among server operators and players. If a feature is obviously unintended (e.g. duplicating items in some way), please refrain from using it, or at least ask if it is allowed. Use common sense.
Please don't add examples of serious bugs/exploits to this page. That should be left as an excercise to readers.