From the Super Mario Wiki
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A Lucky House is a slot machine minigame introduced in Super Mario 3D World. They can appear in every world with the exception of Worlds Mushroom, Flower, and Crown, and can be unlocked after a certain amount of time in a world. The minigame revolves around hitting all four Slot Blocks to match Fire Flowers, Super Leaves, Super Bells, Double Cherries, or Boomerang Flowers to earn a coin reward. The beat of the music determines which icon the player will get.
Depending on the number of icons that match, the amount of coins rewarded are as follows: