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Nep-Enut, or Submarine Nep-Enut, is a type of giant, blue, water-based Gargantua Blargg that hides underwater in the games Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, Yoshi's Island DS, and Yoshi's New Island. Nep-Enut will remain submerged until Yoshi approaches it. Then, the monster will rise, blocking Yoshi's path. Yoshi must shoot inside Nep-Enut's mouth with an egg for it to submerge in the water to hide (and only its eyebrows will remain visible). If Yoshi jumps over the giant monster, Nep-Enut will give chase. Nep-Enuts are much bigger and more detailed in Yoshi's Island DS than in Super Mario World 2: Yoshi's Island. They reappear in Yoshi's Woolly World under the name Giant Nep-Enut.
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