Yoshi and the Mysterious Book

Yoshi and the Mysterious Book
	; American box art; For alternate box art, see the related gallery.
Developer	Good-Feel
Publisher	Nintendo
Platform	Nintendo Switch 2
Engine	Unreal Engine 5
Release date	May 21, 2026;
Languages	English; Japanese; Chinese (Simplified); Chinese (Traditional); Dutch; French (Canada); French (Europe); German; Italian; Korean; Portuguese (Brazil); Spanish (Latin America); Spanish (Europe);
Genre	Platformer
ESRB:	- Everyone
CERO:	- All ages
PEGI:	- Seven years and older
USK:	- All ages
ClassInd:	- General audience
SMECCV:	- All ages
Gmedia:	- Seven years and older
GRAC:	- All ages
GSRR:	- Six years and older
UAE-NMA:	- Seven years and older
ACB:	- General
FPB:	- Parental guidance
Format	Nintendo Switch 2: Game Card Digital download
Input	Nintendo Switch 2: Joy-Con 2 Joy-Con Joy-Con 2 (horizontal) Joy-Con (horizontal) Nintendo Switch 2 Pro Controller Nintendo Switch Pro Controller
Serial codes	LB-AAKGA-EUR-0; LB-AAKGA-JPN-0; LB-AAKGA-KOR-0; LB-AAKGA-USA-0;

Yoshi and the Mysterious Book is a side-scrolling platform game in the Yoshi series developed by Good-Feel, and released worldwide for the Nintendo Switch 2 on May 21, 2026 as part of the Super Mario Bros. 40th Anniversary celebration. The game features a distinct art style resembling paper illustration, featuring low-frame rate animations, painterly textures on Yoshi and interactive creatures, and pencil-esque outlines on faraway objects.

Story

Yoshi during the game's intro

One day in Bowser's Castle, Bowser Jr. walks into a library and finds an unconscious, sentient book known as Mister Encyclopedia (Mr. E for short) on top of a pile of books. Upon opening the book, he sees an illustration of a creature known as the Bewilder Bird flying near Yoshi's Island. Soon after, Bowser Jr. flies to the island with the Junior Clown Car and the book in tow. During his flight, he notices a small magnifying glass dangling from the bottom of the book. Upon using the glass to inspect the book, he gets sucked into it in a flash of light, leaving the Junior Clown Car to crash onto the island without its pilot.

While Yoshi is eating apples from a tree, he and his friends see the Junior Clown Car and Mr. E falling from the sky. As he cannot read his own pages, which hold information on various creatures, Yoshi uses Mr. E's magnifying glass to magically jump into his pages and help investigate them. Inside Mr. E's pages, Yoshi discovers information about each creature, which is then written down in Mr. E.

While exploring Mr. E's pages, Yoshi encounters Kamek and later Bowser Jr. The two repeatedly cross paths with Yoshi while pursuing the elusive Bewilder Bird across various habitats.

Eventually, in the Bewilder Bird Habitat, Yoshi discovers a Crazee Dayzee, which is revealed to be a juvenile Bewilder Bird in disguise. This creature becomes Yoshi's ally for the rest of the habitat and reunites with an adult Bewilder Bird after Yoshi defeats Bowser Jr. and Kamek.

In the aftermath, Mr. E reveals that he was created by a professor to protect all the creatures the Yoshis have been discovering from extinction. He asks the Yoshis to continue helping him document the remaining creatures, and they agree. As they explore more pages from Mr. E, Yoshi once again encounters Kamek and Bowser Jr., who are trying to return to Bowser's Castle but keep getting captured by giant creatures throughout the habitats. Yoshi uses the help of previous allies to rescue them.

Yoshi eventually reaches the Moon, where he reunites with a juvenile Bewilder Bird that can transform into any cataloged creature, aiding Yoshi in rescuing Bowser Jr. and Kamek from a giant vine that has captured them and pulled them underground. Together, Yoshi and the Bewilder Bird reach the core of the Moon to rescue Bowser Jr. and Kamek, but they are then captured by a creature residing there.

It is revealed that the enormous moon hanging above is a colossal Crazee Dayzee on a collision course with Earth. To prevent a disaster, Yoshi must destroy its core. After Yoshi defeats the Moon creature and saves Bowser Jr. and Kamek, a portal opens. He bids farewell to the juvenile Bewilder Bird, which returns to its adult counterpart. They then exit Mr. E's pages just before the Moon explodes.

Back on Yoshi's Island, Kamek, Bowser Jr., and Yoshi emerge from the book. Mr. E congratulates Yoshi for assisting the creatures. Grateful to be back, Bowser Jr. and Kamek leave the island to return to Bowser's Castle and share their experiences. Upon returning to the Castle, Kamek sees Bowser as an adult and Bowser Jr. as his son, which brings him to tears for all the years he missed.

Gameplay

Yoshi exploring a level with a Crazee Dayzee on his back

Yoshi and the Mysterious Book is a side-scrolling platformer starring Yoshi. In the game, Yoshi retains his main abilities from previous Yoshi games. He can eat creatures and objects with his tongue to create eggs, and then aim and throw them at other creatures or objects. Yoshi can also Flutter Jump and Ground Pound. A new move introduced is the Tail Flick, which lets Yoshi grab creatures and carry them on his back. While carrying a creature, Yoshi can make use of their abilities, such as using Crazee Dayzees to make flowers bloom. Other creatures instead help Yoshi traverse in new ways, such as riding on them like a surfboard or floating inside bubbles they create. Yoshi does not lose health when hit by creatures and cannot be defeated in this game.

When opening the pages of Mr. E, the player uses a magnifying glass to explore micro-habitats. The player uses the control stick to view pages, inspect objects, and peer into habitats. Yoshi is then pulled directly into the book's world through the glass. The game's levels focus more on exploration and discovery, with no time limit or game over. Each level is composed of a specific creature's habitat, which starts unnamed. The player's overall objective is to study this creature by discovering its traits. Traits can be discovered by interacting with the creature itself, or by using it to interact with the environment or other creatures. After completing the main goal of each habitat, the player then exits Mr. E, and the traits learned about the creature are written down in his pages. A Star is awarded for each discovery, with one large discovery awarding three Stars and signalling the end of the level. Afterwards, all discoveries are logged in Mr. E's pages, and the player or Mr. E can name the creature.

Names given by the player are subject to the following conditions: they can be up to ten characters long, cannot include words that match an entry in the Nintendo Switch system software's word filter, must not be the same name as another creature's, and are not equivalent to the name of a main character.

Smiley Flowers are scattered across Mr. E's pages. Each chapter shows how many Smiley Flowers there are for each level, as well as how many have been obtained. Finding them rewards Exploration Tools (using five to unlock a tool), interaction with the page's creatures, and puzzle-solving.

Tokens collected during levels can be used to unlock hints towards discoveries which have not been found yet. Initially, they reveal a silhouette of the discovery, but spending more tokens unlocks further details.

Chapters

The game consists of 12 chapters, and Stars can be used to unlock new chapters in the book. Beating the initial six chapters displays the credits, and unlocks four additional chapters, which upon completion displays the credits again and unlocks the last two bonus chapters.

Chapter	Level	Creature studied	Unlock criteria
Chapter 1: Wildwoods	Crazee Dayzee Habitat	Crazee Dayzee	Unlocked by default
	Bunchabee Habitat	Bunchabee
	Scatterpuff Habitat	Scatterpuff
	Croakaoke Habitat	Croakaoke
	Glubbit Habitat	Glubbit
Chapter 2: Mountaintops	Taggit Habitat	Taggit	20 ★
	Milde Habitat	Milde
	Peckadee Nest	Peckadee
	Floofly Habitat	Floofly
	Plumebrella Habitat	Plumebrella
	Thudd Domain	Thudd
Chapter 3: Seaside	Weewoo Habitat	Weewoo	65 ★
	Ouchin Habitat	Ouchin
	Casterway Habitat	Casterway
	Bafloonder Habitat	Bafloonder
	Snurfboard Habitat	Snurfboard
	Nep-Enut Habitat	Nep-Enut
Chapter 4: Settled Valley	Loopdeecoop Habitat	Loopdeecoop	114 ★
	Detonut Habitat	Detonut
	Shy Guy Abode	Shy Guy
	Bugya Habitat	Bugya
	Little Mouser Nest	Little Mouser
	Hauger Habitat	Hauger
Chapter 5: Bug Country	Behedger Habitat	Behedger	167 ★
	Swirm Habitat	Swirm
	Stickiwick Habitat	Stickiwick
	Mawstalk Habitat	Mawstalk
	Slugarang Habitat	Slugarang
	Wooshwing Habitat	Wooshwing
Chapter 6: Remote Isle	Goonie Habitat	Goonie	218 ★
	Huffin Puffin Habitat	Huffin Puffin
	Jetty Jelly Habitat	Jetty Jelly
	Lunge Fish Habitat	Lunge Fish
	Jam Guy Habitat	Jam Guy
	Bewilder Bird Habitat	Bewilder Bird
Chapter 7: Underground	Tumball Nest	Tumball	Complete the first six chapters 285 ★
	Wiggaline Habitat	Wiggaline
	Goopsie Habitat	Goopsie
	Underbit Habitat	Underbit
	Billeau Habitat	Billeau
	Crudwurm Domain	Crudwurm
Chapter 8: Tallest of Trees	Piranha Plant Habitat	Piranha Plant	Complete the first six chapters 353 ★
	Bounseed Habitat	Bounseed
	Wash Squash Habitat	Wash Squash
	Grab-Grass Nest	Grab-Grass
	Spincone Habitat	Spincone
	Gobbobble Nest	Gobbobble
Chapter 9: Miniworld	Magnified Floofly	Floofly	Complete the first six chapters 421 ★
	Magnified Scatterpuff	Scatterpuff
	Magnified Upshoot	Upshoot
	Magnified Hufungous	Hufungous
	Magnified Springhopper	Springhopper
	Magnified Lunge Fish	Lunge Fish
Chapter 10: Moon	Blorp Habitat	Blorp	Complete the first six chapters 500 ★
	Raven Habitat	Raven
	Cuttlefwoosh Habitat	Cuttlefwoosh
	Eleedee Habitat	Eleedee
	Yu Ef Oh Base	Yu Ef Oh
	Crazee Dayzee	Crazee Dayzee
Chapter 11: Special Studies	Short-to-Tall Roll Call	—	Complete the first ten chapters 717 ★
	Seaside Speed Rankings	—
	Sneaky Hide and Seek	—
	Merry Music Festival	—
	All-Terrain Race	—
	A Perilous Passage	—
Chapter 12: Mr. E's Challenges	Explode to Escape	—	Complete the first ten chapters 999 ★
	Protect the Apple	—
	Twilight Bug Catching	—
	Flee from the Leaf	—
	Survive the Risky Skies	—
	Hop or Drop	—

Characters

Character	Description
Yoshi	The main playable character of the game. There are 8 different colored Yoshis to play as: Green, Orange, Pink, Yellow, Light Blue, Red, Blue, and Purple. Each of these colorful options shares the same abilities to use between explorations.
Mr. E	Short for Mister Encyclopedia; a living magical book that falls onto Yoshi's Island, but is incapable of reading his own pages. He seeks the aid of the Yoshis to catalog the creatures on his pages.
Kamek & Bowser Jr.	The main antagonists who get trapped respectively inside Mr. E's pages in pursuit of a mythical Bewilder Bird. They repeatedly encounter Yoshi in boss fights to capture the elusive bird throughout the game.

Creatures

Index

These creatures can be named by the player after the completion of their introductory levels. The player cannot use the same name for multiple creatures, however. Here, the names given are those suggested by Mr. E.

The complete page of Crazee Dayzee.

The Index page 1-2 of the creatures.

The creatures from Mr. E's book.

Creature	Description	Total		First appearance	Last appearance
Creature	Description	Discoveries	Stars	First appearance	Last appearance
Crazee Dayzee	Flower-like creatures capable of making other flowers bloom around them.	33	43	Crazee Dayzee Habitat	Flee from the Leaf
Bunchabee	A small bee with a pointed head that appears in swarms.	29	39	Bunchabee Habitat
Bunchabee (big)^[a]	A larger Bunchabee.	–	–	Bunchabee Habitat
Scatterpuff	Dandelions can be scattered by walking through them. Their seed heads can take root on other objects, causing boulders to crack and enemies to stop moving.	26	37	Scatterpuff Habitat	A Perilous Passage
Croakaoke	Squat duck-like creatures carrying leaves on their heads. They sing notes and can propel Yoshi to higher places when jumped on.	31	41	Croakaoke Habitat	Flee from the Leaf
Glubbit	A frog-like creature with a mouth that resembles a bubble wand. It can create bubbles that Yoshi can enter.	23	30	Glubbit Habitat	Sneaky Hide and Seek
Taggit	Small creatures of varying colors that try to run away from Yoshi.	29	37	Taggit Habitat	All-Terrain Race
Milde	A round pink bubblegum-like creature that pops if stepped on. They can also be blown like bubblegum.	35	47	Milde Habitat	Short-to-Tall Roll Call
Hefty Milde^[a]	A larger Milde which split into regular Mildes when jumped on.	–	–	Milde Habitat	Short-to-Tall Roll Call
Big Milde^[a]	Even larger Milde which split into several Mildes and a Hefty Milde when jumped on.	–	–	Milde Habitat	Short-to-Tall Roll Call
Mega Milde^[a]	The largest form of Milde which split into several Mildes and a Big Milde when jumped on.	–	–	Milde Habitat	Short-to-Tall Roll Call
Peckadee	A teardrop-shaped creature with gray, white and black stripes.	32	40	Peckadee Nest	Twilight Bug Catching
Floofly	A floating cloud with a face and small green wings. Yoshi can ride on them in a similar manner to Para-Beetles.	26	37	Floofly Habitat	Survive the Risky Skies
Big Floofly^[a]	A large, hefty-looking Floofly, made from combining several Flooflies.	–	–	Floofly Habitat	Yu Ef Oh Base
Plumebrella	An umbrella-like bird creature that Yoshi can use to fall more slowly.	25	32	Plumebrella Habitat
Thudd	A giant green creature with goofy eyes, plants growing over it, and a large belly button. It can suck up and shoot Yoshi into the distance.	26	37	Thudd Domain	Short-to-Tall Roll Call
Weewoo	A sea snail-like creature which can play music that can trigger various effects.	28	36	Weewoo Habitat	Merry Music Festival
Ouchin	An urchin- or burr-like creature which sticks to surfaces.	25	33	Weewoo Habitat	Survive the Risky Skies
Casterway	A creature resembling a Spray Fish that uses its fishing rod to catch fish.	27	37	Casterway Habitat
Bafloonder	A balloon-like pufferfish. It changes colors based on how large it is, and can boost Yoshi through the water by blowing bubbles from its fin.	28	35	Bafloonder Habitat	Seaside Speed Rankings
Snurfboard	A skateboard-like creature that can carry Yoshi over water.	28	40	Snurfboard Habitat	All-Terrain Race
Small Snurfboard^[a]	A smaller version of the Snurfboard that is collected by Yoshi.	–	–	Snurfboard Habitat
Nep-Enut	A creature made of water which can grow when combined with others.	25	36	Nep-Enut Habitat	All-Terrain Race
Loopdeecoop	A pink bird with a tall neck spinning a hula hoop.	30	38	Loopdeecoop Habitat	Yu Ef Oh Base
Detonut	A chestnut-like creature that explodes.	31	39	Detonut Habitat	Survive the Risky Skies
Shy Guy	Masked, hooded creatures.	24	34	Shy Guy Abode	Sneaky Hide and Seek
Bugya	A purple fly-like creature with huge lips that uses watermelons as armor and spits seeds.	27	38	Bugya Habitat	A Perilous Passage
Little Mouser	A purple rat thief who can steal objects and creatures from Yoshi's back.	30	39	Little Mouser Nest	Protect the Apple
Hauger	A large, boar-like creature with a red mane that can be ridden by Yoshi. It can jump high in the air and rotate its face like a drill.	25	32	Scatterpuff Habitat	All-Terrain Race
Behedger	A large creature disguised as a bush that attacks with large scythe-like appendages.	30	38	Behedger Habitat	A Perilous Passage
Swirm	A snail that leaves a trail of slime where it walks. When touched, it uncoils and sticks up in the air.	30	38	Swirm Habitat	Short-to-Tall Roll Call
Stickiwick	A spider-like creature that swings by a string of silk from its web.	29	36	Stickiwick Habitat
Mawstalk	A green net-like creature with teeth that can be swung down to eat other creatures.	33	43	Mawstalk Habitat	Twilight Bug Catching
Slugarang	A boomerang-shaped slug creature that Yoshi can gulp up and use as a projectile.	28	37	Slugarang Habitat	A Perilous Passage
Wooshwing	A creature resembling a pink hang glider with orange wings. Yoshi can use it to glide through the air.	26	38	Whooshwing Habitat	Survive the Risky Skies
Goonie	Seagulls with short, round bodies and long wings that can carry Yoshi.	23	33	Goonie Habitat	Survive the Risky Skies
Flightless Goonie^[a]	Goonies that lost their wings and scatter about aimlessly on the ground.	–	–	Goonie Habitat	Survive the Risky Skies
Huffin Puffin	A bird-like creature that usually has babies following it.	29	38

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