Overall happiness and mental health may benefit from these social interactions. Interesting Differences. A well-liked variant is "Sona Showdown," in which players crummy lunchan declare rummy at any point during their turn, giving the game a surprise and strategic component. Including One More Layer of Communication. Another variation adds even more unpredictability and interaction by allowing players to trade one or more cards from their hand with another player's. This is known as "Sona Swap.".
