World 1-4 (Super Mario Bros.)

World 1-4 is the final course of World 1 in Super Mario Bros.. It is a castle course, and the boss is with a Goomba disguised as Bowser.

Layout
Mario will start the level in an elevated area with block stairs heading downwards. There will be a gap with lava and, right after it, a Used Block. There will be two lava gaps, with a Firebar in the ground between them. There will also be a Question Block with a Fire Flower. Past it, there will be a corridor with three Firebars. Passing through it, Mario will reach a room with three Firebars, two on the floor and one on the roof, along two Used Blocks. Mario will reach a room with six hidden Blocks, when the False Bowser's fireballs start to appear. Passing through a gap with a bottom, used to escape from the fireballs, Mario will reach a False Bowser on a bridge and a small platform moving from side to side above it. If Mario jumps over the False Bowser using the platform and touches the Ax, the bridge will collapse, causing the False Bowser to fall into the lava. A Mushroom Retainer is saved and Mario gains access to the World 2.