Tower of the Wing Cap

Tower of the Wing Cap is the Cap Switch stage that unlocks the Wing Cap. It is unlocked when you obtain 10 stars and look into a light in the first floor of the castle.

Inside The Tower
In certain personalized copies of the game, the player can enter one of the towers in this level usually by flying into a window. Oddly, the player usually ends up at the bottom of the tower and must platform upwards for a star. If they appear at the top, they must traverse downwards.