Your main goal is to release your finger from the screen at the moment when the bubble appears in the dotted circle, or it will explode on your face. If you release your finger at the moment when your ball is hovering over the yellow circle, you will ea the maximum bonus and get a few coins. In addition, if you do this several times in a row, you get a combined multiplier. However, the higher the combo you are, the harder the game will be.