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What is Hidden Information?

Hidden information refers to information a player isn’t allowed access to, such as the faces of cards in an opponent’s hand.
Throughout the match and pregame procedures, players are responsible for keeping their cards above the level of the playing surface and for making reasonable efforts to prevent hidden information from being revealed.
However, players may choose to reveal their hands or any other hidden information available only to them, unless specifically prohibited by the rules. Players must not actively attempt to gain information hidden from them.
Source: Wizards of the Coast (2019-11-21)    【Link to Ruling】
Tags: Play