A 52-card standard deck is used for playing Slot Rummy, a variation on the classic rummy card game. It supports two to six players & rummy online apkis a time-based game where the object is to be the first to clear all of the cards from your hand by making sets and runs. Sets are made up of three or four cards with the same rank, & runs are groups of three or more cards in the same suit that occur consecutively.