At its core, Rainbow Rummy adheres to the basic rules of conventional rummy. Combining cards into legitimate sets or runs is the main goal. rummy gold 2 apkA run is made up of three or more consecutive cards of the same color, whereas a set is made up of three or four cards of the same rank but different colors. For example, a set could consist of three Kings in various colors, whereas a run could be a sequence like 4-5-6 in blue.