The world is apparently powered by the Sprixie Princesses, who are freed upon the completion of the world's Castle. It contains seven standard courses, four boss courses (including Bowser's Castle), a Mystery House, a Toad House, and a Sprixie House it is also the only normal world without an Enemy Battle.
Unlike most endgame Super Mario worlds (including World Castle, which came immediately before it), World Bowser is not a volcanic stage rather, 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.
World Bowser (alternatively called Bowser World or Bowser Land, as implied by the name of the world's final level) is the eighth and final story world of Super Mario 3D World and its Nintendo Switch port Super Mario 3D World + Bowser's Fury.
