Memory Match (Super Mario 64 DS)
From the Super Mario Wiki
Memory Match is a minigame belonging to Luigi in Super Mario 64 DS, and also one of the Table minigames in New Super Mario Bros.. Betting three Coins, Luigi will serve a group of eight cards upside down, which the player must match them up with their twins. By completing a challenge succesfully, the player will gain a double amount of Coins bet and will also receive a Star as a point.
If the player matches different cards, a Coin will be given to Luigi from the bet amount, causing likely to lose a Star if Luigi takes all these Coins. Losing all the money to bet, the game will quit.
Memory Master is a harder version of this minigame, having sixteen cards to play. It is only found in Super Mario 64 DS.
 In-game instructions
Pick two matching cards to make them disappear. Clear all the cards to win.