If a user imposes their own rules, to make their own game, that would be a "game", just a user-defined one. Will this user-defined game need to have an objecti

If a user imposes their own rules, to make their own game, that would be a "game", just a user-defined one. Will this user-defined game need to have an objective (i.e. a win condition) to be a "game"? Or, is just making up rules, without any direction, purpose, objective or "win-condition", enough to make it a "game"?