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World 6 is the sixth world of Super Mario 3D World. It is a group of clouds floating near the World 5 and World 1 from the same game. ? Blocks and Coins are scattered throughout the map. It contains five standard courses, an Enemy Blockade, a Toad House, a Slot Machine, a Mystery House, and a Castle. After completing the castle, the Cyan Sprixie Princess will create a Clear Pipe to World Castle.
Levels
| Level Number | Level Name | Preview | Description | Stamp |
|---|---|---|---|---|
| World 6-1 | Clear Pipe Cruise | N/A | A sky-themed level with many Clear Pipes and Fuzzy | ??? |
| World 6-2 | Spooky Seasick Wreck | N/A | A haunted level with many airships, Bully and Peepas. | Fire Flower |
| World 6-B | Fire Bros. Hideout #3 | N/A | N/A | N/A |
| World 6-3 | Hands-On Hall | N/A | A China-styled level featuring the Goomba Mask | ??? |
| World 6-4 | Deep Jungle Drift | N/A | A Jungle-themed level with purple, poisonous water and many gates. | Cat Suit Toad |
| World 6-A | Prince Bully Blockade | N/A | A level where Prince Bully is fought for the first time. | N/A |
| World 6-5 | Ty-Foo Furies | N/A | A snow-themed level with many Ty-Foos and ice skates. | Ice Skate Mario |
| World 6-6 | Bullet Bill Base | N/A | A mechanical level with many conveyor belts and Bullet Bills | Stunned Goomba |
| World 6-7 | Fuzzy Time Mine | N/A | An auto-scrolling tower where a swarm of Fuzzies chases the player. | Fuzzy |
| World 6-Castle | Bowser's Bob-Omg Brigade | N/A | The second Tank course, featuring Boom Boom as a boss again. | Block Stepper |
| World 6-Mystery House | Mystery House Throwdown | N/A | The third Mystery House challenge, this time with five rooms where the player has to use baseballs. | N/A |