The effects of pressing the switch vary, mostly depending on the level they're on. The effects can be temporary (in this case, the switch can be used infinite times or just once) or permanent. They are normally necessary for completing the level (or finding an alternate exit).
Examples of effects
- In World 2-3 of New Super Mario Bros., it rises the water level for a small period of time.
- In World Mushroom-Ghost House of New Super Mario Bros. 2, its effects vary depending in which part of the level it’s in. It mostly makes blocks appear temporarily.
- In World 6-Ghost House of New Super Mario Bros. 2, it makes walls move, usually revealing paths.