To collect all 4 lemonades, you need to break the ice on the pieces below them. It’s not necessary to break all the chains, however, doing so may increase your chance of getting power-ups. Note that there are unrestricted tiles in the bottom, so if you make matches there, the pieces above will fall. It may yet prove helpful when you have very few favorable matches above. Combine your power-ups by exploding them together so that your Rainbow Blast charges faster.