There are several forms of traditional rummy games that have endured over time. Gin Rummy, one of the most well-known varieties, rose to enormous popularity in the US in the betting apps downloadearly 1900s. Two players compete to create melds, which are sets of three or more cards in the same suit or combinations of three or more cards of the same rank, in Gin Rummy. Because players must choose whether to knock to end the round or keep drawing cards to improve their hands, the game is known for its fast-paced action and strategic depth.