Two or more players can play the game, and there are several variations with different twists. Players must form at least two sequences in Inhorror slotsdian Rummy, for example, which usually involves two decks. One of these sequences must be pure (i.e., devoid of a joker). On the other hand, the goal of Gin Rummy, a well-liked variation in the US, is to minimize the number of points in unmelded cards while forming sets and runs.