World 4-Fortress 1

Level
World 4-Fortress 1
Super Mario Bros. 3 Super Mario All-Stars
Level code	World 4-Fortress 1
World	Giant Land
Game	Super Mario Bros. 3
Time limit	300 seconds
Boss	Boom Boom (grounded)
Music track	Fortress BGM Underground BGM
Music sample
Level progression ← Previous World 4-3 Next → World 4-4 Super Mario Bros. 3 levels

World 4-Fortress 1 is the first fortress level and the fourth level overall of Giant Land in Super Mario Bros. 3. This level becomes accessible once the player clears World 4-3 and its own completion opens World 4-4.

Layout

The player starts at the bottom of some stairs, which lead to a narrow hallway with some Hot Feet. At the end of the hall is a sliding Thwomp that will move horizontally when the player gets near, followed by another sliding Thwomp shortly afterward. After the second sliding Thwomp are a group of Warp Pipes, the middle of which will take the player to an underground cave with some Dry Bones and the player can collect a Fire Flower (or Super Mushroom) in one of the ? Blocks. To leave the underground area, the player needs to find two Hidden Blocks and use them as platforms to get over the ledge to the right. If the player does not go down the middle pipe, they will have to avoid one falling and two sliding Thwomps before reaching the exit pipe from the underground area. Next, the player has to move through a long hallway with Hot Feet before reaching Boom Boom. Boom Boom can be defeated using similar methods as his previous fights, though Boom Boom will occasionally jump high in this fight. Defeating Boom Boom and collecting the magic ball will open up a Locked Door nearby on the map.

In the NES version, the underground part of the level has a color palette where green is replaced with silver gray; the stem of the Fire Flower is affected.

Enemies

Sprite	Name	Count
	Hot Foot	6
	Thwomp	4 (horizontal) 1 (vertical)
	Dry Bones	3
	"Boo" Diddly	1
	Boom Boom (jumping)	1 (boss)

Items

Sprite	Name	Count	Notes
	Coin
	Super Mushroom	2	Replaced with one of two power-ups if Mario is already in Super form
	Fire Flower	1	Replaces a Super Mushroom in the first block if Mario is already in Super form
	Super Leaf	1	Replaces a Super Mushroom in the second block if Mario is already in Super form
	Magic ball	1	Ends the stage when collected

Objects

Main area

• 

  ? Block

• 

  Candle

• 

  Ground

• 

  Pipe

• 

  Unbreakable block

Sub area

• 

  ? Block

• 

  Ground

• 

  Pipe

Level map