World C-4

World C-4 is the fourth and final level of World C in Super Mario Bros.: The Lost Levels and the sixteenth secret level overall in said game. It is a redone version of World 7-4.

Layout
The player begins in a narrow corridor with two Fire Bars 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 an "S"-shaped 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 and additional blocks placed at the corners of the sections. The player then has to traverse platforms over a pit of lava while dodging a Lava Bubble, a Fire Bar, and Fire Breath. At the end of the room is the Fake Bowser, which breathes fire (or throws hammers in Super Mario All-Stars) and the bridge has a Fire Bar.