To add a risk and reward element, players in Gin Rummy try to "knock" when they think they have a strong enough hand to win. Indian Rummybingo 777 slots, which frequently uses two decks of cards and permits more intricate melds, is another noteworthy variation. In addition to any sets they can make, players in Indian Rummy are required to form at least two sequences, one of which must be a pure sequence devoid of jokers.