P Switch

P-Switches (also known as Switch Blocks in Super Mario World) are items found in Super Mario Bros. 3, Super Mario World and New Super Mario Bros. When pressed, a P-Switch changes something in the stage for a limited amount of time. This includes filling the area with Silver Coins, and turning Gold Coins into blocks (or vice versa).

In Super Mario World, the gray version of the P-Switch makes most enemies turn into Silver Coins. Collecting eight of these coins awards Mario a 1-Up. Collect one more for a 2-Up. After nine coins, Mario will earn 3-Ups for each additional coin.

In Super Mario Bros. 3's remake, red, yellow, and green P-Switches open the red, orange, and green Toad Houses accessed in the e-Reader world.