There are many thrilling variations of Rummy Joy to suit a range of tastes and ability levels, so it's not a single game. A well-known variation is Gin Rummy, which places an emphasis on creating sets & sequennid slotsces while reducing deadwood, or unmatched cards. In order to add risk and reward to each round, players in this version try to "knock" when they think their total point value is less than that of their opponent's unmatched cards. Indian Rummy is another fascinating variation that adds more complexity by requiring players to form at least two sequences, one of which must be a pure sequence (i.e., devoid of jokers).