Underground opens after the first ending and requires 285 discovery stars. Its caves introduce rolling, stretching, sticking and digging abilities. Gather the flowers before finishing an encounter that changes the habitat: Crudwurm in particular can leave once its armour has been removed.
Choose a habitat or challenge
Each area has its own walkthrough, flower locations and discovery notes. Select a guide below.
| Habitat or challenge | Smiley Flowers |
|---|---|
| Tumball Nest | 5 |
| Wiggaline Habitat | 3 |
| Goopsie Habitat | 6 |
| Underbit Habitat | 4 |
| Billeau Habitat | 4 |
| Crudwurm Domain | 3 |
Tumball Nest
Ride a Tumball and build speed along the ground. Ground Pound to curl it into its rolling form, then use slopes to reach higher ledges.
Open the Tumball Nest walkthrough →
Wiggaline Habitat
Grab the head projecting from a hole and pull. Attach the stretched head to an anchor to keep Wiggaline extended as a bridge.
Open the Wiggaline Habitat walkthrough →
Goopsie Habitat
Carry Goopsie against a wall to stick to it. Climb around the corner onto the ceiling rather than jumping away at each ledge.
Open the Goopsie Habitat walkthrough →
Underbit Habitat
Ride Underbit through the sand and eat creatures along the route. Feeding it increases its size and the objects it can bite through.
Open the Underbit Habitat walkthrough →
Billeau Habitat
Enter the purple gas to reduce gravity. Walk out to draw a gas trail behind Yoshi, then guide that trail through nearby groups of creatures.
Open the Billeau Habitat walkthrough →
Crudwurm Domain
Examine the dirt-armoured body for the parts holding Bowser Jr. and Kamek. Break those armour sections to rescue both captives and complete the main goal.