World 1-4 (Super Mario Bros.)

World 1-4 is the final course of World 1 in Super Mario Bros. and the fourth level overall in said game. It is the first castle course of the game and the series. A fake Bowser is encountered at the end, which is actually a Little Goomba in disguise.

This level has been re-created in Super Mario Advance 4: Super Mario Bros. 3 as Classic World 1-4, and in New Super Mario Bros. 2 in the Gold Classics Pack from Coin Rush on the final course along with World 1-1 from said game.

Layout
The player starts the level on an elevated area with stairs heading downwards, ending at a pit of lava. Afterward is a platform with a Fire-Bar and surrounded by lava, with a ? Block containing a power-up above it. After a corridor of Fire-Bars on the ceiling, there is a room with more Fire-Bars placed on both the ceiling and the floor. Next is a room containing several Hidden Blocks before the bridge with the fake Bowser, which has a horizontally moving lift above.

Super Mario Bros. Deluxe challenges
In Super Mario Bros. Deluxe, the player can collect five Red Coins, find a hidden Yoshi Egg, and get a medal based on their score. The Yoshi Egg is found in the top-middle Hidden Block in the larger empty space with the other Hidden Blocks before the fake Bowser, and the score to beat is 13000 (12000 in the Japanese version ). The Red Coin locations are: Additionally, the mushroom retainer at the end of the castle is replaced with a door to the end results area.
 * Above the level's ? Block
 * In the hallway with the Fire-Bars
 * Red Coins three and four are in the proceeding area, between the Fire-Bars
 * Above the fake Bowser

Trivia

 * World 6-4 is the same as this level, but with more Fire-Bars and Podoboos added.