Naval Piranha's Castle
From the Super Mario Wiki, the Mario encyclopedia
Naval Piranha's Castle is a stage located in Yoshi's Island and found in Super Mario World 2: Yoshi's Island and Yoshi's Island: Super Mario Advance 3. The stage is located in the depths of a sewer, which is really a maze, where various types of Wild Piranhas appear. The boss of this stage is a common Wild Piranha on which Kamek casts a spell, turning it into Naval Piranha. If the player throws an egg at the bandaged navel three times, it will be defeated.
Yoshi will start off in a sunset jungle area outside of the castle, with smiley hills, palm trees and bushes in the background. At the end of this small area is a Warp Pipe, where Yoshi can enter the castle, which takes place in the sewers. Inside the castle, Yoshi will have to cross a narrow corridor, with a Caged Ghost blocking the way. Since the ghost spits Shy-Guys or Woozy Guys, Yoshi can eat them to lay eggs and throw them at the ghost, eventually opening the wall. Then, Yoshi will pass through flippers, leading to a small maze infested by Hootie the Blue Fish and small Ravens. This maze also has Red Coins, and corridors with water flows, pushing Yoshi to the direction of the water. There are also Wild Piranhas in the water, sometimes being pushed by the water in Yoshi's direction. After this, Yoshi will get to an area, where he'll get advise on how to make eggs bounce off walls to reach out-of-reach items. A Message Block tells Yoshi on how to do so. He can throw eggs in the walls, thus making them skip on the surface of the water, reaching the items. Yoshi will also have to reach a Flower by using this move. Progressing through the level, Yoshi will find more humid corridors, infested by Hootie the Blue Fish and Ravens, and some Wild Ptooie Piranhas. Nipper Plants can also be found here. Yoshi can find various Red Coins, and two Flowers in this maze. Some Aqua Lakitus can also be found here. Yoshi will also have to hit Caged Ghosts and Wild Piranhas in his way with eggs. After passing through an area with Nipper Plants, a Wild Ptooie Piranha, and a tulip, Yoshi will find the red door leading to the boss.
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