World 1-4 (Super Mario Bros.)
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World 1-4 is the final course of World 1 in Super Mario Bros. It is the first castle course of the game and the series. A Bowser Impostor is encountered at the end, which is actually a Goomba in disguise.
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 Bowser Imposter, and the score to beat is 13000. The Red Coin locations are:
Additionally, the Toad at the end of the castle is replaced with a door to the end results area.