

Some parts of some fortresses (all in Worlds 3, 5, 6, and 7) have light that usually has the same color as the pipes in whatever color scheme the appropriate part of the fortress uses. This palette is exclusive to the World 3 fortresses and can have water. (P-Switches in this palette are colored light blue.) Areas with this palette sometimes have a checkered floor. (P-Switches in this palette are colored light gray.) Lava is often found in areas with this palette. In the NES version, fortresses (barring World 2- and World 6- 2) can have any of three different color schemes: They are levels with Boom Boom as their only boss, and he must be defeated to open Locked Doors and gain access to other parts of the world. Instead, fortresses, also known as Mini-Fortresses, are usually found in the middle of worlds.

3, the fortresses that advance Mario to the next level do not appear. begins with Mario/Luigi outside a fortress, despite the level before taking place inside a castle World 1-1 in The Lost Levels also begins in front of a fortress. Additionally, castles appear to be a fortress stacked upon a larger section.

They also appear at the very beginning of underground and underwater levels, where Mario/Luigi enters the level via a Warp Pipe. and Super Mario Bros.: The Lost Levels, fortresses are usually made from red bricks (except for the one at the very beginning of World 6-3 in the former game and World 7-3 in the latter game, which are colored gray like the rest of the level), and are usually located at the end of most levels, except for the third and fourth levels of each world, which end with a castle and take place inside that castle respectively. History Super Mario series Super Mario Bros.
