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a.k.a. "The GM is always right." The unwritten rule in tabletop role-playing games (such as [Dungeons & Dragons]) which grants the game master the right to suspend or override the published game rules whenever s/he deems necessary. Similar to a house rule; however, rule zero may be invoked unilaterally, at any time and does not have to be agreed upon in advance by the players. When abused, can lead to an [inconsistent], confusing, or [frustrating] experience for the players.
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