Blackjack is an unlicensed card game made by American Video Entertainment. The rules are simple: the dealer gives you and themselves two cards each. You both then have to get a number of cards so that the sum of the cards' values is as close to 21 as possible without going over. Getting exactly 21 is known as a Blackjack, which gives you an automatic win. If you go over, you lose. Otherwise, whoever is closest to 21 wins the bet.
In this run, ShesChardcore manages to break the bank (get all the money from the dealer's table) with a single doubled down hand of Blackjack in record time.
Watch this run being played back on a real console.