The primary objective of blackjack is to beat the dealer by having a hand value closer to 21 without exceeding it. If your hand goes over 21, you “bust” and lose the game. If the dealer busts and you don't, you win.

• Number cards (2-10) are worth their face value.
• Face cards (Jack, Queen, King) are worth 10 points each.
• Aces can be worth 1 or 11 points, if an 11 would cause your hand to bust; it is counted as a 1, if not it is counted as a 11.

Here is how the game is played:

1. Each player, including the dealer, is initially dealt two cards. (the dealer has one faced down and the other up)
2. Players can choose to “hit” (take another card) or “stand” (keep their current hand).
3. Players can continue to hit until they decide to stand, or until they bust by exceeding 21.
4. After all players have finished their turns, the dealer reveals their facedown card.
5. The dealer must hit until their hand reaches at least 17 points.
6. If the dealer busts, all remaining players win.
7. If the dealer doesn't bust, then the hands of all remaining players are compared to the dealer's hand, and the players with a hand larger than the dealer but lower than 22 wins.

One of the unique aspects of Black Jack is that an Ace can either be 11 or 1 depending on what the player decides. Here is an example of a hand involving an Ace.

Example 1: The player is dealt a 5 and an Ace. they then draw and get a King. If the player decided to keep the Ace an 11 then they would bust and the dealer would win but you can switch the Ace to 1 and not bust.

The challenging aspect of this is how would you implement this so the game automatically handles this for the player.