World 6-2 (Super Mario Bros.: The Lost Levels)
World 6-2 is the second level of World 6 in Super Mario Bros.: The Lost Levels, taking place underwater. The level was originally part of VS. Super Mario Bros. as World 7-2 and was imported into Super Mario Bros.: The Lost Levels.
Like with other underwater stages, the level begins with the player character walking into a Warp Pipe leading to the main area. The level is filled with underwater currents and coral walls with Cheep Cheeps and Bloopers swimming around. After the fifth Blooper are downward moving lifts that will push the player down into the current if they get caught underneath; however, the placement of the second set of lifts with the coral to the left can cause the player to clip through the coral if they get caught between the two objects. After those lifts are several coral walls with Cheep Cheeps swimming through them before coming to a Koopa Paratroopa, and after the next Koopa Troopa ahead are more downward moving lifts. At the end of a narrow passage is a Koopa Paratroopa followed by the Warp Pipe to the Goal Pole, which has a couple of Hidden Blocks before it the player can use if they fall off the staircase.