Taking the Round. Players need to create runs of three or more consecutive cards of the same suit, or sets of three or four cards of the same rankall rummy apps list, in order to win a round. After forming sets and runs, a player can "knock" by laying down their remaining cards in appropriate combinations and discarding one card from their hand. Next, any unmatched cards that the other player has can be laid off onto the sets & runs of the other player.