Super Mario All-Stars / Super Mario World Cheats

Power Switches are those in-game blue buttons that reverse the rolls of the coins and solid bricks and vice-versa upon jumping on top of them. During the split-second "pressed flat" animation of the button after usage, you can use Yoshi to lick it back up--when you spit it out, it will be an entirely new Power Switch that will extend the duration of the effect of the switch.