Game Master

The position of Game Master (ゲームマスター, Gēmumasutā) gives one the ability to craft a tale using a game board. This position is held by a Witch/Sorcerer and the game board is Rokkenjima, specifically, from October 4th to October 5th of 1986. When creating a tale, the Game Master must always avoid creating a Logic Error or the game will instantly be destroyed.

There are/were other game boards than Rokkenjima in the Umineko universe, according to several other witches.

Known Game Masters

As mentioned in the original continuity

Game Masters	Games
Beatrice	Legend of the Golden Witch Turn of the Golden Witch Banquet of the Golden Witch Alliance of the Golden Witch Land of the Golden Witch (never read)
Lambdadelta	End of the Golden Witch
Battler	Dawn of the Golden Witch Twilight of the Golden Witch
Bernkastel	Requiem of the Golden Witch Twilight of the Golden Witch
Hanyū Furude	All of the story arcs in Higurashi no Naku Koro ni (according to Lambdadelta in the Dawn of the Golden Witch manga)