Yellow Switch Palace

The Yellow Switch Palace is a place containing a giant, yellow ! Switch. It's the first Switch Palace that Mario and Luigi find in the game Super Mario World as the palace is not hidden. It's on top of Kappa Mountain in the northwest of Yoshi's Island.

When the ! Switch is activated, all the transparent yellow squares turn into yellow ! Blocks. During gameplay after the switch has been activated a mushroom appears when hitting a yellow ! Block.