If you want to be a great card game player, you must understand the controls. The rules that govern how cards are dealt, how turns are taken, all rummy app apkand how players engage with one another vary from game to game. In Uno, for instance, players alternately play cards that match the top card on the discard pile in terms of either color or number, whereas in Hearts, players must do the same unless they are out of cards in that suit.