These levels are accessible from pipes, some are in plain view and others are well-hidden. Mario enters from a pipe at the bottom of the level, and has the choice of hitting one of three ? blocks. If this block is determined to be "correct", which is entirely random, Mario is rewarded with a coin and the block displays a circle. If it is "incorrect", the incorrect SFX is played and the entire row of blocks, including already correct blocks, turn into used coin blocks. If Mario successfully clears an entire row of three blocks, the final block will yield a 1-up. Mario has the opportunity to earn a maximum of five lives per room.
The following levels have one of these bonus rooms:
- Donut Plains 1
- Donut Plains 3
- Morton's Castle
- Vanilla Dome 3
- Ludwig's Castle
- Forest of Illusion 3
- Chocolate Island 5
- Valley of Bowser 1
- Valley of Bowser 3
100 Bonus Stars
Main article: Bonus Game Room
When Mario collects 100 bonus stars, he enters a bonus room where he has the opportunity to earn a maximum of eight extra lives. Mario must stop each spinning block, and gets a life for any row, column, or diagonal of matching icons.
A Switch Palace is a level that contains one of four colored switches that activates the dotted colored !-blocks throughout the worlds.
Switch palaces use the bonus room graphics tileset. All palaces have two rooms, the first contains a gimmick that allows Mario to earn some lives, and the second is a long hallway with the switch at the very end. Once the switch is pressed, Mario cannot re-enter the switch palace.
|Level Themes found in Super Mario World|
|Bonus | Bridge | Castle | Cave | Grassland | Forest | Fortress | Ghost House | Mushroom (Theme) | Sky | Underwater|