World Castle is mainly a lava-themed world that is also features off of Bowser's Castle designs.
- World Castle-1: Fort Fire Bros.
- World Castle-2: Switchblack Ruins
- World Castle-3: Red Hot Run
- World Castle-4: Boiling Blue Bully Belt
- World Castle-A: Brolder Blockade is Back
- World Castle-B: Prince Bully Blockade is Back
- World Castle-C: Fire Bros. Hideout #4
- World Castle-5: Trick Trap Tower
- World Castle-6: Rammerhead Reef
- World Castle-7: Simmering Lava Lake
- World Castle-Castle: Bowser's Lava Lake Keep
- World Castle-Toad: Captain Toad Gets Thwomped
- This is the first world to have a name in Super Mario 3D World. The previous six are just given numbers. The unofficial name World 7 can still be used for its name, however.