From the Super Mario Wiki
Picture Poker is a single-player minigame in Super Mario 64 DS and New Super Mario Bros. In the former, it is classified as one of Luigi's minigames; in the latter, it is classified as a Table minigame.
It is a casino-style card game in which the player automatically bets coins that their five-card hand beats Luigi's. After being dealt their hand, the player can bet more coins and/or have some or all of their cards replaced with random cards from the deck. Luigi then, if need be, replaces cards in his hand (which appear face down to the player) with random cards from the deck. The hands are then shown. If the player's hand is better, they win a set amount of coins based on both the rank of their hand and the amount of coins bet ranging from a Pair (2x) to Flush (16x). If Luigi's hand is better, the player simply loses the coins bet. In the rare occurrence that a draw happens, the player gets their coins back.
The player is awarded Stars with each victory and is deducted Stars (if they have any) with each loss. The minimum bet is determined by the amount of Stars in the player's possession; the bet increases by one for every five Stars, with a maximum of four at 15 stars. If the player runs out of coins, the game is lost and must be restarted.
The player can choose between 3, 5, or 7 rounds. Which player goes first is chosen randomly. There's not any betting.
Get a better hand than Luigi to win! If you're confident that your hand's the best, increase the number of coins you bet!
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