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.
Mahjong is a tile-based game that was developed in the 19th century in China and has spread throughout the world since the early 20th century. It is played by four players. The game and its regional variants are widely played throughout East and Southeast Asia and have also become popular in Western countries. The game has also been adapted into a widespread online entertainment. Similar to the Western card game rummy, mahjong is a game of skill, strategy, and luck. To distinguish it from mahjong solitaire, it is sometimes referred to as mahjong rummy.
Poker is a family of comparing card games in which players wager over which hand is best according to that specific game's rules. It is played worldwide, but in some places the rules may vary. While the earliest known form of the game was played with just 20 cards, today it is usually played with a standard deck, although in countries where short packs are common, it may be played with 32, 40 or 48 cards. Thus poker games vary in deck configuration, the number of cards in play, the number dealt face up or face down, and the number shared by all players, but all have rules that involve one or more rounds of betting.
Sheepshead is an American trick-taking card game derived from Bavaria's national card game, Schafkopf, hence it is sometimes called American Schafkopf. Sheepshead is most commonly played by five players, but variants exist to allow for two to eight players. There are also many other variants to the game rules, and many slang terms used with the game.
Mornington Crescent is an improvisational comedy game featured in the BBC Radio 4 comedy panel show I'm Sorry I Haven't a Clue (ISIHAC), a series that satirises panel games.
Mao is a card game of the shedding family. The aim is to get rid of all of the cards in hand without breaking certain unspoken rules which tend to vary by venue. The game is from a subset of the Stops family and is similar in structure to the card game Uno or Crazy Eights.
Canasta is a card game of the rummy family of games believed to be a variant of 500 rum. Although many variations exist for two, three, five or six players, it is most commonly played by four in two partnerships with two standard decks of cards. Players attempt to make melds of seven cards of the same rank and "go out" by playing all cards in their hands.
Eleusis is a shedding-type card game where one player chooses a secret rule to determine which cards can be played on top of others, and the other players attempt to determine the rule using inductive logic.
Zendo is a game of inductive logic designed by Kory Heath in which one player creates a rule for structures ("koans") to follow, and the other players try to discover it by building and studying various koans which follow or break the rule. The first student to correctly state the rule wins.
The game of Bartok, also known by a number of other names, such as Wartoke, Warthog, Bartog, Bentok, Last One Standing or Bong 98, is a card game popular in Australia where the winner of each round invents a new rule which must be obeyed for the remainder of the game. It belongs to the "shedding" or Eights family of card games, whereby each player tries to rid themselves of all of their cards. The game progresses through a series of rounds with a new rule being added in each round, thus making the game increasingly complex as it progresses. These newly introduced rules may modify any existing rules.
A metagame, broadly defined as "a game beyond the game", typically refers to either of two concepts: a game which revolves around a core game; or the strategies and approaches to playing a game. A metagame can serve a broad range of purposes, and may be tied to the way a game relates to various aspects of life.
Zork Zero: The Revenge of Megaboz is an interactive fiction video game, written by Steve Meretzky over nearly 18 months and published by Infocom in 1988. Although it is the ninth and last Zork game released by Infocom before the company's closure, Zork Zero takes place before the previous eight games. Unlike its predecessors, Zork Zero is a vast game, featuring a graphical interface with scene-based colors and borders, an interactive map, menus, an in-game hints system, an interactive Encyclopedia Frobozzica, and playable graphical mini-games. The graphics were created by computer artist James Shook. It is Infocom's thirty-second game.
Penultima is a game of inductive logic, played on a chess board. It was invented by Michael Greene and Adam Chalcraft in Cambridge in 1994. The game is derived from the chess variant Ultima, and played with a standard chess board and pieces, each piece having different movement and capture rules from standard chess. In a manner similar to the game Mao, which was a popular game in Cambridge at that time, the rules for each piece vary from game to game, and are initially kept secret from the players. Penultima is similar in style to Eleusis, Zendo and Mao. The name of the game is a pun on "penultimate" and "Ultima", the name of a different chess variant with all pieces replaced by fairy pieces with their own mechanics.
Twenty-eight is an Indian trick-taking card game for four players, in which the Jack and the nine are the highest cards in every suit, followed by ace and ten. It thought to be descended from the game 304, along with similar Indian games known as "29", "40" and "56".
Four color cards is a game of the rummy family of card games, with a relatively long history in southern China. In Vietnam the equivalent game is known as tứ sắc.
Go Fish or Fish is a card game usually played by two to five players, although it can be played with up to 10 players. It can be played in about 5 to 15 minutes.
The fictional universe of the Discworld novels by Terry Pratchett features a number of invented games, some of which have gone on to spawn real-world variants.
Court piece is a trick-taking card game similar to the card game whist in which eldest hand makes trumps after the first five cards have been dealt, and trick-play is typically stopped after one party has won seven tricks. A bonus is awarded if one party wins the first seven tricks, or even all tricks. The game is played by four players in two teams, but there are also adaptations for two or three players.
Quarante de Roi or Quarante de Rois is an historical French, point-trick, card game for four players in partnerships of two. The name comes from its highest scoring combination of four Kings which is worth 40 points.