Super Fun 21 is a variation of blackjack that introduces unique rules and features designed to enhance player engagement and increase excitement. Unlike traditional blackjack, players are given additional options such as the ability to double down after a split and to surrender at any time. The game is played with a standard deck of cards, but it often includes bonuses for specific hands, such as a natural 21 consisting of an ace and a face card. The dealer typically stands on all 17s, which can influence the strategy.