In Rummy Mate, card counting is an essential skill for winning. Players can learn a great deal about their opponents' hands and their own by keeping track of golden envelopethe cards that have been played & those that are still in play. With this knowledge, players will be better able to decide which cards to pick up from the draw or discard pile and which to keep. Card counting Also aids players in predicting the movements of their rivals and modifying their own tactics accordingly.