Knot-Wing the Koopa
From the Super Mario Wiki, the Mario encyclopedia
Knot-Wing the Koopa is a Koopa Paratroopa boss in Yoshi's Woolly World. He serves as the mid-boss of World 2. He also reappears in World 4 and World 6. In all three battles, his primary attacks are Ground Pounding and dashing inside his shell.
In World 2, Yoshi can defeat Knot-Wing by licking the knot on his neck at the right time when he is on the ground, while he is performing his Ground Pound attacks. After doing so, Knot-Wing will flip over onto his back, exposing the bandages on his underside, allowing Yoshi to attack him with a Ground Pound. In World 4, Yoshi must allow Knot-Wing to slam into a broken part of the bridge, which accidentally causes him to touch the spikes at the bottom of the water and flip over to reveal his weak spot. In World 6, Knot-Wing can only be defeated when the Bill Blaster on his back is hit with a yarn ball thrown by Yoshi instead of untying a knot on his neck.
All three boss battles with Knot-Wing can be replayed in the Boss Tent.
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