. Blackjack is a casino banking game. Blackjack · [HOST] · Doom 3 · Doom 2: Hell on Earth · DOOM · Head Soccer · Bloxorz Zap and Destroy · Zombie Pacman · Zombies Can't Jump · Zombies Can't Jump. It is the most widely played casino banking game in the world. This family of card games also includes. It uses decks of 52 cards and descends from a global family of casino banking games known as "twenty-one".