Moon Coins are types of Star Coins that only appear in World Star of New Super Mario Bros. 2. They have moons that resemble a 3-Up Moon imprinted on them rather than stars. These coins, however, cannot be used as Star Coins (therefore they cannot be used to remove Star Coin Signs) and are only for collecting and are required to obtain a star icon on the player's profile and nothing more. Previously it was believed that it unlocked unlimited toad houses, but that is done by having finished all levels, including the secret levels and thus has nothing to do with the Moon Coins.
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