True or false: Players may generally reveal hidden information unless explicitly banned by the rules of the game or format.

The correct answer is true because, in Magic: The Gathering, players are permitted to reveal certain types of hidden information as long as it is not explicitly restricted by the rules specific to the game or format being played. For example, players might reveal their life totals, the contents of their graveyards, or cards in hand during certain game circumstances, such as when using an ability that requires revealing information.

While there are instances where revealing specific information—like secret card information or private strategies—could be explicitly prohibited or discouraged by official rules, the general principle is that players have the autonomy to share hidden information as they see fit. This encourages transparency and can foster a better understanding of the game state among players.