Rummy's beginnings can be found in early 19th-century card games like the Mexican card game Conquian. Gin Rummy, Indian Rummy, and Kalookisatts king are just a few of the many variations that have emerged over time, each with its own set of rules and subtleties. A standard 52-card deck is usually used in this game, which can be played by two to six players. However, in some variations, jokers may be used as wild cards.