The mechanics of the game and the play is the same as a regular game of Blackjack but there are several rule variations that make the game unique.
- The game is played with a single deck but some casinos use two decks.
- The dealer hits a soft 17.
- Players may double down on any number of cards.
- Players may split pairs up to four times, including aces.
- Players may take late surrender on any number of cards, even after hitting, splitting or doubling down.
- A player hand totaling 20 or less made with six or more cards automatically wins. (except after doubling down.)
- A player hand totaling 21 made with five cards or more (except after doubling) pays 2 to 1.
- A player natural blackjack always wins even if the dealer has one.
The biggest rule variation for Super Fun 21 is that all natural blackjacks pay even money instead of the usual 3 to 2 found in most games. The only exception is a blackjack in diamonds which pays 2 to 1. This means that you can expect to be paid even money for 15 out of every 16 natural blackjacks.
House Edge
With most natural blackjacks paying even money and the dealer hitting soft 17 the house edge for the single deck game is 1.16 percent. The double deck game has a house edge of 1.30 percent. This is almost as high as the bad Blackjack games that pay $6 to $5 for a natural blackjack. Super Fun 21 is considered one of the new novelty game and most serious Blackjack players will avoid this game.

