World 7-4 (Super Mario Bros.: The Lost Levels)

World 7-4 is the fourth and final level of World 7 from Super Mario Bros.: The Lost Levels and the twenty-eighth level overall in said game.

Layout
The player begins in a narrow corridor with a Fire-Bar and a drop down to a pit of lava with a horizontally moving lift. At the end of the corridor is a Hidden Block containing a power-up directly against the wall, followed by a Fire-Bar before five rails of downward moving platforms. Afterward is another corridor with a Fire-Bar and Koopa Troopas on narrow pillars. The corridor leads into a room with Buzzy Beetles, which leads into another narrow section with Fire-Bars hanging from the pillars above. The player then has to traverse platforms over a pit of lava while dodging a Podoboo, a Fire-Bar, and Fire Breath. At the end of the room is the fake Bowser, which throws hammers and the bridge has a Fire-Bar.

Trivia

 * World C-4 is a harder version of this level, with additional Fire-Bars and added terrain to make them more difficult to avoid.