is an upcoming platform game published by Nintendo for the Nintendo Switch 2. The game follows Yoshi as he enters a living encyclopedia, where he seeks and interacts with peculiar creatures in the book's pages in order to solve puzzles, complete objectives, and traverse through levels. Scheduled for release on May 21, 2026, the game succeeds Yoshi's Crafted World (2019) as the ninth main installment in the Yoshi series and the fifth released for a home console.
Yoshi and the Mysterious Book is a side-scrolling platform game set primarily in a living encyclopedia called "Mr. E".
The premise revolves around Yoshi as he enters Mr. E's pages in order to search for and interact with various creatures. Each level, or chapter, of the game has different creatures, each with unique attributes. When Yoshi finds a creature, he can utilize its traits and abilities to solve puzzles and traverse levels. The world inside Mr. E's pages is animated in a style similar to traditional stop-motion animation, with a lower frame rate in certain character actions such as when jumping.
The game was announced in a Nintendo Direct presentation on September 12, 2025, as a part of the 40th anniversary of Super Mario Bros. (1985), and revealed gameplay mechanics such as interacting with creatures. On March 10, 2026, for the celebration of Mario Day, a trailer was released detailing further gameplay features and announced the game's release date as May 21, 2026.