From the Super Mario Wiki, the Mario encyclopedia
They are a special kind of big, multi-colored Banana Coins that have all of the Kongs' colors on them. When collected, all of the Kongs receive five extra Banana Coins, even if a Kong has not yet been rescued. There is one coin in every world of the game (except Angry Aztec and Fungi Forest, which have two), and a total of seven coins are found on DK Isles. These coins are always found buried under DK Dirt Piles. To release a 5-Banana Coin, the player must step on a DK Dirt Pile and press and hold the button, releasing a shockwave attack that destroys the DK Dirt Pile and reveals the special coin. No 5-Banana Coins are found in Hideout Helm.
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