One important rule in rummy is that in order to win, players must form at least two sequences, one of which must be a pure sequence. A sequence that spin gamesis impure may contain jokers, whereas a pure sequence consists only of cards in the same suit. To determine which card combinations you must form in order to win, it is imperative that you comprehend this rule. Primarily, forming pure sequences early in the game is a key strategy element in Rummy.