Blackjack, also known as twenty-one, is the most widely played casino banking game in the . Number cards count as their natural value; the jack, queen, and king (also known as "face cards" or "pictures") count as 10; aces are valued as either Cards : 52 to. Everything you need to know about Blackjack Rules. Learn the rules and master Cards are worth the value of the number on the face of the card. To start. Black Jack oder Blackjack bezeichnet: Black Jack, ein Karten-Glücksspiel; Black Jack Black Jack Island, Insel im Lake County, Florida; Black Jack Mine Number One, Mine im McKinley County, New Mexico; Black Jack Mine Number Two.