E3 2014 screenshot of Yoshi's Woolly World. The characters and environment are depicted as living yarn knits, a theme that continues throughout the game.
Yoshi's Woolly World is a platform game in which the player assumes the role of Yoshi. Similar to developer Good-Feel's previous title Kirby's Epic Yarn, the game is set in a world where the characters and environment are composed of yarn and cloth. Yoshi retains much of his moveset from the Yoshi's Island series of games, including using his tongue to swallow enemies and using his flutter jump to reach hard areas, and many elements such as flowers and mystery clouds return. However, unlike other games where swallowing enemies would produce eggs which Yoshi could then throw, Yoshi instead produces balls of yarn. These yarn balls have various uses when thrown, such as tying up fearsome enemies or filling in certain platforms and objects. Players can also gather white chicks, which produce temporary cloud platforms when thrown. The game also supports up to two players co-operatively, with players able to swallow and throw their partners, allowing them to reach otherwise inaccessible areas.
Yoshi's Woolly World was first announced by Nintendo CEO Satoru Iwata on January 23, 2013 under the tentative title Yarn Yoshi. The game was stated to be in development by Good-Feel with game designer Takashi Tezuka supervising the project. The game was absent from E3 2013 but was playable at E3 2014, where it was given a tentative release time frame of "the first half of 2015."