Players in Gin Rummy add a risk and strategy element that keeps them alert by aiming to "knock" when they think they have a strong enough hand rummy circle free fire diamondto win. For those who prefer fast rounds & fierce competition, this variation is especially alluring. Indian Rummy is another fascinating variation that adds special rules like the need for players to form at least two sequences, one of which has to be a pure sequence devoid of jokers.