Mastering Rummy: An All-Inclusive Guide Rummy is a well-known card game that has enthralled players for generations worldwide. Forming runs & sets from a standardredeem app deck of cards is the fundamental aspect of the game. Three or four cards of the same rank but different suits make up a set, whereas three or more cards of the same suit in a row make up a run. The goal is to combine your cards into these combinations so that you can eventually "go out" by throwing away your final card.