The remaining cards are then arranged in a draw pile. Players take turns selecting cards from the discard or draw piles in an effort to create better hands through melds. Until one player successfully places777 all of their cards in appropriate combinations, the game is over. The idea of "knocking," which permits players to end a round when they feel they have formed enough melds, is one of the distinctive features of Rummy Nobob. A player discards one last card, lays down their melds, and reveals their hand when they knock. The remaining cards are then used by the other players to lay down any melds they can create.