Blue Switch Palace
The Blue Switch Palace is the last of the four Switch Palaces in Super Mario World. It's found in the Forest of Illusion behind the water level Forest of Illusion 2. It contains a line of Used Blocks with several Spinies walking across the top.
The trick is to collect a handful of coins near the edge of the bottom row first before activating any of the P-Switches. Once that's finished, the player can hit the blue P-Switch to make the top row become coins and the bottom to solid brick. The player should immediately hit the silver P-switch,turning the Spinies into Silver Coins. The player should quickly jump onto the solid bottom row and collect as many top-row coins as possible. Once the P-switches wear off, the player can freely collect the bottom row before continuing to hit the blue ! Switch in the next room. Upon hitting the switch, the level will be completed and all blue block outlines will become solid bricks.
