Tower of the Wing Cap is a secret level in Super Mario 64. It houses the switch that activates the wing cap. It has 8 red coins scattered around in the air, which the player must collect the wing cap to obtain them. Collecting the red coins makes a secret star appear. If the player falls, they get teleported back to the lobby and not lose a life.
The level reappears in Super Mario 64 DS and was retitled Switch? Instead of the wing cap switch, it has the ? block switch, which activates ? blocks in the entire game. ? blocks contain Power Flowers or feathers. The feather only appears when playing as Mario, and turns Mario into Wing Mario, like the Wing Cap. Other characters fall on entering the stage and get 3 coins and get teleported back to the lobby.