The Yellow switch is one of the 4 colored switches found in Super Mario World. When the Yellow Switch is stomped on all the dotted blocks will turn into solid ! blocks.The Yellow Switch is named "Yellow Switch Palace" in Super Mario World. When the level is entered it will look much like the bonus game. There is a POW switch and when stomped on coins will appear everywhere! It should also be noted that whenever the Yellow Switch Block is hit a mushroom will always come out.