|Debut Appearance||Yoshi's Story|
|Latest Appearance||New Super Mario Bros. 2|
The Question Switch (or ? Switch or ?-Switch Block in New Super Mario Bros.) would appear in Super Mario 64 DS on the secret level that is titled ? Switch, which use to be called Tower of the Wing Cap. The switch can be used as a one-shot replacement to the three ! Switches. When the ? Switch is hit, all of the ? Blocks will turn solid.
In Yoshi's Story when Yoshi presses on a ? Switch, it will disappear and then part of the level will change. It acts like a P-Switch though part of the level will change. The countdown form the area will have music play and when it starts to play quicker, it will mean that the area will be reverting back to normal in a short time.
They would also appear in New Super Mario Bros. with an orange look instead of the red look. When these switches are hit, they will either change or add an area of the level. This could vary from just moving platforms or to flipping the whole level upside down for a temporary or even permanent amount of time. This will vary from switch to switch. They would return in New Super Mario Bros. Wii and New Super Mario Bros. 2 with the same function.