Because of its ease of use & captivating qualities, the game became a mainstay in American homes and cemented its status as one of the greatest card games ever made. The basics of Gin Rummy. Gin Rummy is arummy cash games apk popular variation of Rummy that is usually played by two players. In this variation, players try to minimize the number of points in their hands at the conclusion of each round while forming sets and runs. Players must determine when to end the round depending on the potential of their hand in Gin Rummy, which has melding and knocking mechanics that give it strategic depth. Additional Notable Differences.