Swipe the toy ball to make it bounce up and fall down. This will clear off pieces around the all in a circle.
You can select to start a level with a ball by selecting it from the menu before the level starts. This will place one of both types of Jack-in-a-Boxes, as well as a toy ball, on the board.
You can unlock a ball on the board by matching five pieces.
Swipe with another boost to increase the power!