Here are the full rules of the game. Blackjack may be played with one to eight decks of card decks. Aces may be counted as 1 or 11 points. Blackjack is one of the most popular games at any casino. Let our expert explain the rules to you so that the. Today, Blackjack is the one card game that can be found in every American gambling casino. As a popular home game, it is played with slightly different rules.