Bowser's Lava Lake Keep
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Bowser's Lava Lake Keep, or World 
Castle-
Castle, is the seventh castle level of Super Mario 3D World and the eighth course in World Castle. It is unlocked via completing Simmering Lava Lake, and its own completion temporarily frees the Red Sprixie Princess. However, Bowser immediately kidnaps all the Sprixie Princesses and builds a Clear Pipe to his own amusement park, World Bowser.
Layout
The level starts in an area with many platforms, Lava Bubbles, and Boomerang Bros., one of which drops a Boomerang Flower upon defeat. A nearby P Switch must be uncovered by kicking a Kick Bomb at the nearby wall hiding it. Hitting the switch results in a nearby bridge being lowered, which gives the player access to a Ka-Thunk and Fire Bro. infested area, with the Checkpoint Flag near. After traversing a narrow pathway filled with Lava Bubbles, the player has to defeat two Hammer Bros. in order to reveal a Warp Box that transports the player to a boss fight with Bowser in his Bowser Mobile. When the player defeats Bowser, a Warp Box brings the player to the area with the Sprixie Princess and the Goal Pole. However, when the player frees the last princess, Bowser appears and steals all seven once again.
Green Stars
- Green Star 1: Near the beginning, the first green star is above the lava, next to a wall.
- Green Star 2: Before activating the P-Switch, the player must use the cat form to climb up the drawbridge to reach the green star.
- Green Star 3: After the checkpoint, the green star is floating above the lava, and can only be reached by a Boomerang from a Boomerang Flower.
Stamp
- After the first green star, the player has to Wall Jump his or her way up above the P-Switch to get the stamp.
