Red Switch Palace
From the Super Mario Wiki
The Red Switch Palace is the third switch palace Mario or Luigi can encounter in Super Mario World and its remakes. It is found in Vanilla Dome and unlocked by finding the secret exit of Vanilla Dome 2; coding inside Super Mario World indicated that the Red Switch Palace would actually have been encountered much later (in fact, nearing the end of the game at Valley of Bowser). This level cannot be replayed after it has been completed.
The palace consists of two rooms, which the player has 200 seconds on the Timer to complete. The first room has eight Koopa Troopas, each separated by an Empty Block, with one Koopa next to a Yellow Shell. There is a Switch Block and a line of coins above the Koopas.
The second room is empty except for the red ! Switch, which is activated by jumping on it.
When the Red ! Switch is hit, all red Dotted-Line Blocks become red ! Blocks. These blocks help the player progress through levels by filling in certain gaps, and allowing easy access to a few secret exits.
Levels with red ! Blocks
Red ! Blocks can be found in fifteen levels:
Names in other languages