Lemmy's Swingback Castle

Lemmy's Swingback Castle is at the end of Acorn Plains. This is also the first Koopaling Castle in the game. This level is guarded by Lemmy Koopa which his airship is flying around the castle which he fights inside. When Lemmy himself is defeated Mario stomps around on his airship, which flies from the castle and crashes somewhere in Layer-Cake Desert where Morton Koopa is.