Luigi-Jack is a multiplayer Table minigame in New Super Mario Bros. that is named after and played like the actual card game, BlackJack.
The way to win the coins is to have a bigger number than the other player without going over twenty-one. Each player starts with thirty coins and they can earn more by getting a better hand. If a player gets twenty-one exactly in three, four or five cards, then the player gains twice the amount of coins from the other players but if a Luigi-Jack is drawn, then the player gets triple coins. If the player goes over 21, then that player will lose five coins. Whoever has the most coins at the end of three, five, or seven rounds is declared the winner of the game.