World Bowser

World Bowser (called Bowser World on Miiverse) is the eighth and final Story Mode world of Super Mario 3D World. Unlike most endgame Mario worlds (including World Castle, which came immediately before it), World Bowser is not a volcanic stage: instead, it is a large amusement park built in the likeness of Bowser, with a volcano in the back, and it sits high above every preceding world. It contains eight standard courses, two Boss Arenas, a Mystery House, a Toad House, a Sprixie House, and Bowser's Castle. The world is apparently powered by the Sprixie Princesses, who are freed upon the completion of the world's Castle. The bosses encountered here are Pom Pom, Motley Bossblob, Queen Hisstocrat, and Bowser, who attacks as Meowser. This world is the only Story Mode world without an Enemy Blockade.

Trivia

 * If you glitch on to the pipe, then fall, you'll land on World 3. This means World Bowser is above World 3.