Fortresses, like castles, are set to be demolished upon completion by default, but this can be changed in the Overworld Editor of Lunar Magic. Yoshi is not allowed to enter these levels, just like castle levels. In the original Super Mario World, there are four fortresses.
Common ElementsSecret Exits to access. These more difficult elements include Grinders, Layer 3 smashers and spikes, wooden spikes, and, of course, lava. All fortresses contain lava except the Vanilla Fortress, which is entirely underwater.
Fortress themed levels in SMW
|Level Themes found in Super Mario World|
|Bonus | Bridge | Castle | Cave | Grassland | Forest | Fortress | Ghost House | Mushroom (Theme) | Sky | Underwater|