World 5-1 (Super Mario Bros.: The Lost Levels)

World 5-1 is the first level of World 5 in Super Mario Bros.: The Lost Levels and the seventeenth level overall in said game. It is the longest level in this game. This level introduces hanging pipes and the use of wind. In the original and Super Mario Bros. Deluxe versions, the level has a standard grassland palette, though the Super Mario All-Stars version is snow themed.

Layout
The player begins in front of a row of Buzzy Beetles beneath a row of ? Blocks that contain Coins. Across the gap after the first low hanging pipe with a Piranha Plant, there are four more hanging pipes with Piranha Plants the player must avoid as they are jumping across the gap below. Next is a Koopa Paratroopa followed by a row of Koopa Troopas and two Bill Blasters. Through the next Warp Pipe is an underground area containing coins and the only power-up in the stage. After the pipes are a set of stairs, which wind will be blowing on when the player jumps about halfway up; there is also a hidden 1-Up Mushroom in one of the Hidden Blocks against the back of the stairs. The player must jump with the wind to cross the large gaps ahead and will end up in front of a Bill Blaster. Through both a hanging and a ground pipe with Piranha Plants are a row of enemies leading up to a large gap before a flight of stairs. Across the gap after the stairs are Koopa Paratroopas and rows of Brick Blocks, with the top-right-most block containing a Beanstalk to Coin Heaven, which will drop the player at a Warp Zone to World 6. If the player does not take that route, they will have to find two Hidden Blocks to use as platforms to reach the top of the ledge above. After the long hill is a pipe with a Piranha Plant followed by the Goal Pole, though the player can also reach the Warp Zone to World 6 by jumping over the pole.

Level statistics

 * Power-ups: 1 (Super Mushroom or Fire Flower)
 * 1-Up Mushrooms: 1
 * Secret areas: 3