From the Super Mario Wiki, the Mario encyclopedia
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World D-3 is the third level of World D in Super Mario Bros.: The Lost Levels. The fortress walls in the background appear in the original version of the game with items being found in Brick Blocks, but the walls are absent in the Super Mario All-Stars version, with items being found in Hidden Blocks.
The player starts next to a group of six Bill Blasters, and in the third gap between them is a Brick Block with a power-up. After a pipe with a Piranha Plant, there are two Hammer Bros. that will charge at the player. Before the next Bill Blaster, there is a row of Hidden Blocks that can be used as cover against the next group of Hammer Bros. After another group of six Bill Blasters is a Springboard that the player can use to reach the top of a pillar with a Red Koopa Troopa on it, which can be used to defeat the Hammer Bro. below. Next is another Piranha Plant, three more Bill Blasters, two Hammer Bros., and a Koopa Paratroopa before Bill Blasters in a stair formation that lead to the Goal Pole.