One card is positioned face-up to begin the discard pile, and the other cards form a draw pile. In order to form melds—combinations of cards that satisfy play rummy.comthe rules of the game—players alternately draw cards from the draw pile or the discard pile. The fundamental idea behind Rummy Bloc is to create legitimate combinations, which can be either sets (three or four cards of the same rank) or sequences (three or more cards of the same suit in consecutive order).