Boiling Blue Bully Belt

Boiling Blue Bully Belt, or , is the fourth course in the seventh world of Super Mario 3D World and its Nintendo Switch port Super Mario 3D World + Bowser's Fury, World Castle. It becomes accessible by beating either Switchblack Ruins or Red-Hot Run, and  respectively. Completion of this level will unlock Brolder Blockade Is Back and Prince Bully Blockade Is Back.

Layout
True to its name, this course is set on many stone structures above a blue lava lake, and Bullies serve as the main enemies. Throughout this level, arrow platforms appear from the lava from time to time.

The first area in the level has the arrow platforms rising and sinking back into the lava but has very few Bullies. After the Checkpoint Flag, Mario must traverse a series of cylinder platforms and arrow platforms that emerge from walls, while dodging spinning spiked rolls. At the end of this section, there is a Warp Pipe that takes the player to the final section, where there is a tilting platform with three Bullies on it. After they are defeated, a path appears, leading to three more arrow platforms and the Goal Pole following them.

Green Stars

 * Green Star 1: Near the start of the level, there is a Green Ring that Mario can touch to make eight Green Coins appear floating above some arrow platforms. Collecting them all reveals the first Green Star.
 * Green Star 2: This Green Star is inside a Mystery Box just before the Checkpoint Flag area. There, the character must push a Bully into the lava to get it.
 * Green Star 3: The final Green Star is next to the second-to-last cylinder during the second area, floating above a smaller one.

Stamp

 * The level's stamp is found on a small circular platform before the Mystery Box. The stamp is a Brick Block.

Names in other languages
Bullys an der Lavafurt