FrogReaver
As long as i get to be the frog
I’d suggest the GM is most often used by the game as a game mechanic (at least in d&d style games).It’s worth noting the distinction between rules and mechanics. Mechanics are a subset of rules. “Roll 1d20 + mods vs TN” is a mechanic. “This game has a referee and they’re in charge of interpreting the rules and mechanics” is a rule. “This is a fantasy game” is a rule. “Each player takes a turn” is a rule.
AI generated answer -
Game mechanics are the interactive elements of a game that modify the game state, governed by rules and producing consequences