P Switch

P-Switches (also known as Switch Blocks in Super Mario World and New Super Mario Bros.) 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.