Editing World D-4

{{image|more=yes|Needs in-game screenshot from the original FDS version}}

|before_alt=

|boss=[[Fake Bowser]]s ([[Spiny|Spinies]]) <small>([[Bowser's Brother]] and [[Bowser]] in ''All-Stars'')</small>

'''World D-4''' is the fourth and final level of [[World D]] in ''[[Super Mario Bros.: The Lost Levels]]'' and the twentieth and final secret level overall in said game, as well as the final level in the game overall. Like with [[World 8-4 (Super Mario Bros.: The Lost Levels)|World 8-4]], lightning flashes in the background of the level and the level's title card in ''[[Super Mario All-Stars]]''.

The player starts in a room similar to that the one at the start of 8-4. The player has to jump across a pit of [[lava]] while avoiding a long [[Fire Bar|Fire-Bar]], then while avoiding another Fire-Bar at the end of the corridor, the player can find a power-up in a [[Hidden Block]] against the wall. Jumping across a lava pit with a [[Lava Bubble|Podoboo]] jumping out and avoiding the next Fire-Bar, the player then has to bounce off of a [[Koopa Paratroopa]] and avoid pipes with [[Piranha Plant]]s, along with [[Cheep Cheep|Cheep-cheep]]s that jump out of the lava until the player reaches the next hall. After a falling [[lift]] and a Fire-Bar, the player will find a [[Warp Pipe]] at the end of the hallway.

The next area is an overworld area, with the first enemy being a charging [[Hammer Bro]]ther. After the second pipe with a Piranha Plant, [[wind]] will begin blowing. The player will next encounter two Koopa Paratroopas, two [[Blooper|Bloober]]s, another Piranha Plant, and a hidden [[Poison Mushroom]] before a flight of stairs, which the wind will stop blowing beforehand. After a jump across a large pit, the player will find a Warp Pipe with a Piranha Plant.

The fourth and final area has the player return to the castle, where they will encounter a [[fake Bowser|fake]] [[Fire Breath|fire-breathing]] [[Bowser's Brother]] (or in the case of ''All-Stars'' the actual Bowser's Brother who only throws [[hammer]]s). Above him is a row of [[? Block|?]]s, with the fifth from the right containing a power-up. The next Warp Pipe with the Piranha Plant and Bloobers surrounding it will take the player back to the start of the level. After the pipe is a Hammer Brother, followed by a narrow passage that the player will have to [[crouch]] and slide through if they are in a [[Super Mario (form)|Super]] or [[Fire Mario|Fire]] form. Using a lift to get up over a ledge, the player then has to time a fall into a narrow passage while avoiding a Podoboo. Finally, the player will encounter a [[fake Bowser]], who throws breathes fire and has a Fire-Bar above him (in ''All-Stars'', this was replaced by the actual Bowser himself who only throws hammers). Upon defeating him or touching the [[axe|ax]], the player will save [[Princess Peach]] and complete the game.

==Enemies and obstacles==

{{Number of enemies

|image1=[[File:SMBLL Red Piranha Plant.png]]

|name1=[[Piranha Plant|Red Piranha Plant]]

|count1=10

|image2=[[File:FireRodSMB.gif]]

|name2=[[Fire Bar|Fire-Bar]]

|count2=5

|image3=[[File:Podoboo Sprite SMB.png]]

|name3=[[Lava Bubble|Podoboo]]

|count3=2

|image4=[[File:SMB Red Koopa Paratroopa Sprite.gif]]

|name4=[[Koopa Paratroopa|Red Koopa Paratroopa]]

|count4=1

|image5=[[File:SMB Swimming Cheep Cheep Sprite.gif]]

|name5=[[Cheep Cheep]] (Red)

|count5=(infinitely spawned offscreen from the bottom in the first area)

|image6=[[File:SMB Hammer Bro Throwing Hammer Sprite.gif]]

|name6=[[Hammer Bro]]

|count6=2

|image7=[[File:SMB Green Koopa Paratroopa Sprite.gif]]

|name7=Green Koopa Paratroopa

|count7=2

|image8=[[File:SMBLL Sky Bloober.png]]

|name8=[[Blooper|Sky Blooper]]

|count8=5

|image9=[[File:BowserBrotherSMBTLL.png]]

|name9=[[Fake Bowser|Fake]] [[Bowser's Brother]] ([[Spiny]])

|count9=1 (mid-boss, FDS only)

|image10=[[File:SMAS SMB Bowser Sprite.png]]

|name10=Bowser's Brother

|count10=1 (mid-boss, SNES only)

|image11=[[File:SMB Bowser Breathing Fire Sprite.gif]]

|count11=1 (final boss, FDS only)

|image12=[[File:SMAS SMB Bowser Sprite.png]]

|name12=[[Bowser|Bowser, King of the Koopa]]

|count12=1 (final boss, SNES only)

 

|image1=[[File:SMBCoin.gif]]

|name1=[[Coin]]

|count1=47

|notes1=15 in [[? Block]]s, up to 10 in one [[Coin Block]], and 22 in open air.

|image2=[[File:SMBLL Super Mushroom Sprite.png]][[File:Fire Flower SMB.gif]]

|name2=[[Super Mushroom|Mushroom]]/[[Fire Flower]]

|count2=2

|notes2=

|image3=[[File:SMBLL Poison Mushroom Sprite.png]]

|name3=[[Poison Mushroom|Poisonous Mushroom]]

|notes3=Hidden in an [[Hidden Block|invisible block]].

}}

==Level maps==

{{Wide image|NES LL World D-4 Map.png|6160|Map of World D-4}}

{{Wide image|SMAS LL World D-4 Map.png|5696|Map of World D-4 (''[[Super Mario All-Stars]]'' version)}}

{{SMBTLL levels}}