What is a Ball of Yarn Match-3 Element? There will be times where you'll find puzzles that have unraveled balls of yarn which are away from a basket. Your task is to roll the ball of yarn back until they're inside the basket for you to retrieve.
Ball of Yarn (Source: Playrix.com)
In order to move the ball of yarn, you need to activate a power up or match pieces. Power ups roll the ball of yarn longer than matching pieces.