The joker's addition gives the game a more unpredictable and strategic aspect. The "Old 51" card is a useful tool because players can use it rummy nabob 666to finish runs and sets. The joker's moniker in certain Rummy variants serves as the inspiration for the game's name. A keen sense of strategy, rapid decision-making, and a strong memory are necessary for keeping track of played cards in the fast-paced game of Rummy Old 51 Bonus.