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Hidden Coins (also known as Dash Coins) are special types of coins that have been seen in the New Super Mario Bros. games, Yoshi's New Island and Super Mario Run. Hidden Coins are somewhat rare, and only appear in a few levels.
Hidden Coins first appear as an outline of a Coin; if Mario or another character passes through the outline, it will then turn into a regular coin after a moment.
In Super Mario Run, Hidden Coins make their first appearance in Ghost-Door Deception. This time, they appear more commonly than in New Super Mario Bros. Wii. Touching one can reveal a regular Coin, a Pink Coin, a Purple Coin, or a Black Coin, depending on the level.
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