21+3, on the other hand, is based on the first two cards the player receives and the one for the dealer. The Perfect Pairs side bet allows gamblers to stake on the possibility of the first cards that they are dealt being the same. This variation applies the same procedure of play as nearly all blackjack variations, and the difference comes in the inclusion of the Perfect Pairs and 21+3 side bets. Perfect Pairs and 21 + 3 Blackjack by Realistic Games, like most other game variations, are mostly similar to the original version with only some slight differences to the appearance and rules of play. Among the numerous variations the software company has released, Perfect Pairs and 21 + 3 Blackjack at casinos online is among the most popular.

Realistic Games is one of the biggest online gaming software developers, and it has explored the most popular game categories on the online realm, blackjack being one of them.