Knot-Wing the Koopa's Fort
From the Super Mario Wiki
This is a fort level that contains many Koopa Troopas and Koopa Paratroopas, as well as 8-bit Koopa shells found in walls that can be used as normal Koopa shells. There are lots of strings in this level that have to be unravelled in order to open up a new area to keep playing the level. There are lots of keys in this level, allowing players to open doors to progress through the level.
After finishing the level, Kamek will enlarge Knot-Wing the Koopa, engaging the boss battle. To defeat Knot-Wing, Yoshi has to eat his wings, and then ground pound on his belly. Knot-Wing will then retreat into his shell and charge at Yoshi while ricocheting off walls. Knot-Wing is defeated after the third hit.
Collecting all the Wonder Wools knits Ashen Yoshi back together.
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