The game is won by the player with the lowest score at the end of a set number of rounds. There are many variations of rummy, such as Canasta, Indian Rummy, and rummy ballGin Rummy, each with unique rules and subtleties of gameplay. To "knock" before the opponent can, for example, Gin Rummy, which is usually played between two players, stresses the formation of melds quickly. The idea of jokers as wild cards is introduced in Indian Rummy, giving the game an additional strategic dimension.