How To Complete Every Billeau Discovery in Yoshi and The Mysterious Book

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There are many creatures to encounter in Yoshi and the Mysterious Book, with each chapter revealing more of these strange and wonderful beings. One of the most unusual is Billeau.

Billeau appears as a toxic cloud of gas. Many of their discoveries involve ways to choke out other creatures. They also move in a very interesting manner, and here’s how to unlock all of their discoveries.

Where Is Billeau Initially Met?

You first meet Billeau after completing the game’s credits and unlocking the second half of the chapters. They are specifically found in Chapter Seven, Underground, as one of the last creatures you encounter there.

Although they have a unique function, they also appear in later chapters. However, most of their discoveries can only be unlocked during their initial stage.

Every Billeau Discovery

Billeau has several discoveries associated with them, but nothing overly complicated. Here are all of them and how to unlock each:

Discovery	How To Get
Cloudy, Bitter, Best Coughed Back Up	Try to eat Billeau.
Dense Gas Makes For Buoyant Bounding	Jump into Billeau and float around.
Gas Follows A Trail!	Leap into and out of Billeau to make the gas follow you for a while.
Doesn’t Like Water	Try to lead Billeau towards a body of water.
Enjoys Spaces That Fit Its Size	Bring Billeau into a room that fits them perfectly, like the square cave early in the level.
Springhopper Group Engulfed	Fly Billeau into each Springhopper you see to turn them purple.
Doesn’t Like Sunlight	Take Billeau to the surface. They will refuse to go further.
Drayzee Dayzee Engulfed	Fly Billeau into a Crayzee Dayzee.
Billeau Gas Is Flammable!	Drag Billeau’s gas cloud into a flame to cause it to explode in a chain reaction.
Scattered The Fallen Leaves	Fly through patches of grass to wilt it and spread the leaves around.
Blew Up A Rock	Use Billeau’s gas trail to cause a nearby rock to explode.
Blew Up The Distant Rock	Trigger a chain explosion further away from Billeau’s main body or fire source.
Engulfed The Golden Butterfly	Fly into the Golden Butterfly to turn it purple.
Golden Bug Engulfed	Fly into the Golden Bug to turn it purple.
Made It Through The Narrow Path	Drag Billeau’s gas through a winding passage below the campfire.
Not Good To Breathe!	Stay in narrow passages where Billeau’s gases linger.
Bunchabee Swarm Engulfed	Fly into a swarm of Bunchabee on the surface and turn them purple to pacify them.
Engulfed Many Types Of Creatures	Fly into all creatures in the level to turn them purple—necessary to complete the level.