Bowser's Lava Lake Keep (World Castle-Castle) is the boss and final level in World Castle of Super Mario 3D World, unlockable with 130 green stars after completing Simmering Lava Lake. It contains three green stars and a stamp depicting Boomerang Mario. Completing it unlocks a cutscene of Bowser rekidnapping all seven Sprixie Princesses in a single jar, followed by the clear pipe to World Bowser.
