The rules of blackjack are simple.

Your goal is to get your hand as close as possible to 21 without exceeding it.

Ace cards can be worth either 1 or 11 points.

Jack, King, and Queen cards are worth 10 points.

Numbered cards 2-10 are worth their face value.

On your turn, you can draw another card or stand.

The dealer will then take their turn by revealing/dealing cards until they reach a total value of 17 or more.

You win if your card count is greater than the dealer's without exceeding 21 or when the dealer's hand count exceeds 21.

You have a Blackjack! (Your first two cards total 21, and the dealer does not also have a blackjack).

The dealer wins if your card count exceeds 21 or the dealer's card count is greater than yours without exceeding 21.

With this application you can set number of decks. It does not generate random cards.