

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.
