Yoshi's Woolly World is a 2.5D side-scrolling platformer starring the anthropomorphic dinosaur Yoshi known from many Mario games. The game uses a visual style where all characters and the environment look as if they are made out of cloth or yarn, similar to Kirbys' Epic Yarn by the same developer. Many Yoshis live together peacefully on Craft Island in the Handmade Ocean. One day the evil wizard Kamek arrives on his broom and turns all the Yoshis into bundles of yarn. Only two are able to hide and they need to rescue their friends.
The gameplay revolves around Yoshi's use of balls of yarn, which can be carried at all times and have various uses. They can be launched at enemies, aiming with a reticule, to ensnare them. In other sections they are used to interact with the environment, to activate platforms or reveal hidden sections, or to reach and grab items that are far away. Yoshi can use a flutter jump for a short while to reach platforms while hovering. White chicks can be gathered to create temporary cloud platforms.
Players are encouraged to find all the collectibles in each level, rather than just completing them. There are also short sequences where Yoshi can transform himself into different objects, such as an umbrella or a motorbike. Each level has many secret areas and there are jewels to collect, pieces of yarn (Wonder Whools), five smiley flowers, and stamp patches. They are used to buy power-ups, unlock new levels, new Yoshi skins, and Miiverse stamps respectively.
The game features 48 levels, grouped into eight worlds, each with a mini-boss in the middle and a world boss. There is also a mellow mode, next to a classic mode, where Yoshi can fly through levels without having to land. Using a power badge it is possible to skip courses. In the local cooperative mode players each control a Yoshi and can work together, for instance by swallowing and launching the other Yoshi to launch it to a hard to reach area.
The game also supports Amiibo, providing new skins and a power-up that lets players create a second Yoshi at any moment. It is also possible to save a Yoshi skin to use it during cooperative games. Many other Amiiboos are supported as well, proving yarn versions of various characters.
The 2017 Nintendo 3DS port of Yoshi's Woolly World contains all the levels of the Wii U game, with extra stages added, especially for Poochy. The 3DS version also introduces the Poochy Pups, which will serve as indicators of special treasures and secrets.
The original release date was October 16th, 2015 for the Wii U . A port was released on the Nintendo 3DS in 2017, with additional features and stages.