Blue Switch Palace

The Blue Switch Palace is the last of the four Switch Palaces in Super Mario World. It is found in the Forest of Illusion behind the water level, Forest of Illusion 2, the level it is unlocked in. Like all the other Switch Palaces, the Blue Switch Palace cannot be replayed after its completion.

Overview
The palace consists of two rooms, which the player has 200 seconds on the timer to complete. The first room contains a blue Switch Block, a Gray P Switch, and a line of Brown 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 either of the switches. Once that is finished, the player can hit the Switch Block to make the top row become coins and the bottom become solid brick. The player should immediately hit the Gray P Switch, turning the Spinies into Gray Coins. The player should then quickly jump onto the solid bottom row and collect as many top-row coins as possible. If all the Gray Coins are collected, the player gets an extra life. Once the switches wear off, the player can freely collect the bottom row before continuing to the next room. The player is not forced to hit either switch to progress through the level, however.

The second room is empty except for the blue ! Switch, which can be activated by jumping on top of it.

Gameplay effects
Once the blue ! Switch is hit, all the blue Dotted-Line Blocks become Blue Blocks. The Blue Blocks help the player progress through the levels by filling in gaps and allowing some secret exits to be reached. Blue Blocks appear in only 13 levels after that.

Levels with Blue Blocks
Blue Blocks can be found in these levels:
 * Vanilla Secret 1
 * Forest Fortress
 * Forest Secret Area
 * Chocolate Fortress
 * Chocolate Island 1
 * Chocolate Island 2
 * Chocolate Island 4
 * #6 Wendy's Castle
 * Valley of Bowser 1
 * Valley of Bowser 2
 * Valley of Bowser 4
 * Front Door
 * Star World 5