Rummy 777: A Complete Guide Rummy 777 is a popular online card game that has drawn players from all over the world. While still maintaining the essence of classic rurummy leadermmy gameplay, it adds a contemporary twist that makes the game even more enjoyable. Players use a standard deck of cards to form sets and sequences in order to minimize their point total by melding their cards together. Simple yet captivating: merge all of your cards into legal combinations to be the first to declare "Rummy.".