Tower of the Wing Cap

The Tower of the Wing Cap is a castle tower in the sky that contains the Wing Cap's ! Switch. Upon entering the level, Mario will be granted with a Wing Cap which he can use to fly around with. Upon landing on the tower, Mario will be able to press the Red ! Switch, which in turn will make all the Red ! Blocks solid. A Power Star can also be found here.

In Super Mario 64 DS the area was simply retitled "? Switch". The ! Switch was also changed to the ? Switch, which activated all of the ? Blocks in the game. However, the feel of the level more or less stayed the same. Only Mario was granted with wings upon entering. If any characters other than Mario access it, they still flip as doing a level intro, but they flip into the abyss which immediately transports them back into the castle.

The entrance is located on the first floor of castle. Once Mario has collected ten Power Stars (fourteen in SM64 DS), sunlight will be shining down from the ceiling. If Mario stands in the sunlight and looks up, he will be transported to the level.

Although the sunlight will disappear once the ? Switch has been activated, Mario can still return to the level by standing in the same spot and looking up.

Star
There is only one level in this area. Using the wings that he is granted upon entering the level, Mario must fly around the area and collect the eight Red Coins floating in the air in the four compass directions. The Red Coins are found in groups of two. Due to the fact that Mario slowly loses altitude while flying, he'll have to reenter the level and try again if he drops below the point the coins are at.

Trivia

 * Before being transported to the course one can briefly see in the ceiling the picture of a blue sky with a white Sun. This same picture is seen on the second floor in normal paintings that Mario can't enter, and even later in the entrance holes of Rainbow Ride and Wing Mario Over the Rainbow.
 * The tower the Sand Bird flies around in Super Mario Sunshine vaguely resembles the Tower of the Wing Cap, due to a similar layout.
 * Mario's Rainbow Castle from Mario Party also resembles the area. Mario's wing cap even appears on a tower on the board.
 * Noki Bay in Super Mario Sunshine is accessed in a similar way; by standing on a similar pattern on the streets of Delfino Plaza and staring at the real sun.
 * This is the only level that Mario enters the stage flying with the Wing Cap. On the other levels, he must triple jump to take off.
 * Entering this course is the only time zooming in the camera is required.