Games with concealed rules are games where the rules are intentionally concealed from new players, either because their discovery is part of the game itself, or because the game is a hoax and the rules do not exist. In fiction, the counterpart of the first category are games that supposedly do have a rule set, but that rule set is not disclosed. Actual games Discovery games Eleusis: A card game in which one player secretly decides on a rule which determines which cards may be played on top of each other. The other players then use deductive logic to work out the secret rule. Haggle: A party game in which the Gamemaster divides a set of cards and a subset of the full rules among players and allows them to trade for other cards and rules. Mao: A shedding-type card game where the winner of a round adds a concealed rule of their choice to all subsequent rounds. Paranoia: A tabletop role-playing game in which the rules are considered "classified". Only the Gamemaster has full knowledge of the rules, while other players must deduce them by trial and error as they proceed through the game. (The game acknowledges that players may read the gamemaster section, but demonstrating knowledge of the rules is considered treasonous, and the gamemaster may also make arbitrary changes.) Penultima: A chess variant in which the spectators make secret rules governing how the pieces move and capture. The two players are unaware of the rules and must discover them by inductive reasoning. Scissors: A party game in which a pair of scissors is passed between players, with the passer declaring that they are being passed "open" or "closed" based on an individual and secret rule. The other players must use observation to deduce the rule each player uses to make the declaration. Whose Triangle Is It?: A party game in which one player points to three people or objects, forming an imaginary triangle, and then asks "Whose triangle is it?" The triangle belongs to the first person to speak after the triangle is drawn, but this rule is not told to new players, and the game is for new players to figure out what the rule is. Zendo: A game in which one player creates a rule for structures to follow and the other players try to discover the rule by building structures Hoax or joke games