Wonder Wool

Wonder Wools are collectible items that appear in Yoshi's Woolly World. There are five Wonder Wools in each level, all in a variety of different colors; there are 275 Wonder Wools total in the game. Wonder Wools are Yoshis that have been transformed by Kamek; the Yoshis are made up of five Wonder Wools each. The color of the Yoshi determines the colors of the Wonder Wools it is made up of. If the player collects all five Wonder Wools in a level, a Yoshi pattern is unlocked. Unlike Smiley Flowers or Beads, Wonder Wools cannot be collected by throwing a Yarn Ball at them. However, a Yoshi can throw another Yoshi at the Wonder Wool to collect it. In the final stage (6-8) Kamek creates giant magenta Wonder Wools, which are used to empower Baby Bowser for the final battle.

Trivia

 * During the game's development and pre-release, Wonder Wools were known as Yarn Balls, however this name was used for the balls of wool Yoshi creates and throws during the game.