Editing World D-4

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.