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You can tell which piece it is by looking at the color at the top of the ball.
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Activating it by tapping will destroy all the pieces with the most number of tiles on the board.
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Activating it by swiping will destroy all pieces similar to the adjacent piece you just swiped it with. Rainbow Balls are created when you match 5 pieces in a row or column together. Rainbow Balls clears the board of 1 type of piece. All of these power-ups can be activated by swapping them with an adjacent piece or tapping them. However, matches of 4 and 5 pieces are and will result in the creation of special power-ups. As the name suggests, you must match three similar pieces in a row or column to earn points. Match-3 games are straightforward and simple.
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