Your enjoyment of this classic card game can be improved by being aware of these variations, regardless of your level of experience or desire to learn. Often just called "Rurummy rainbowmmy," Classic Rummy is the original form of the game that has spawned innumerable variations. This version is usually played with two to six players and a standard 52-card deck. Players must create valid sets (three or four cards of the same rank) and runs (three or more consecutive cards of the same suit) in order to achieve the simple goal.