Hookbill the Koopa's Castle
From the Super Mario Wiki
Hookbill the Koopa's Castle is the last stage in World 4 of Super Mario World 2: Yoshi's Island. It was the home of Hookbill the Koopa until Kamek came and transformed him into a Gargantua Koopa Troopa in an attempt to slow down Yoshi.
Volcanic Areas
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