World 1-4 (Super Mario Bros. Special)
The level starts off with a tight corridor with two Fire-Bars, followed by a ? Block containing a Magic Mushroom or Fire Flower over a small platform. Past this is a corridor with three Fire-Bars on the ceiling, which is followed by a lift generator with all of the lifts going downward. After this are two more Fire-Bars in a corridor, with a Hidden Block containing a Magic Mushroom or Fire Flower beside the rightmost Fire-Bar. Following this are two pits, which lead to a section with three Warp Pipes. If the player were to enter the leftmost Warp Pipe, they'd find themselves in an underground section filled with pits and coins. At the end of this area is a Warp Pipe, leading to the third Warp Pipe in the group. Past this is another Warp Pipe immediately followed by Bowser over a bridge. At the end of this bridge is an Ax, which, upon collecting, defeats Bowser. After this, a mushroom retainer will tell Mario that Princess Peach is in another castle.