A sequence is considered pure if it is created without the aid of a joker, whereas an impure sequence is created with the aid of a joker. To win at Rummy Cash 51, it's essential to recognize the difference beonline games rummytween pure and impure series. Players are prohibited from taking more than one card at a time from the discard pile, which is another crucial rule to be aware of. This rule keeps things fair by preventing players from picking up multiple cards at once and giving them an unfair advantage. Also, you should be aware of the points that are attached to each card because these can affect your final score in the game.