Chains
The more bubbles that are popped in a single chain, the more super bubbles will remain behind, which result in more points. You are limited by the number of moves, not time, so carefully plan your actions. Chains do not have to be in a straight line. As long as there are bubbles nearby, you can swipe over them to include them in your chain, even if they were not connected your first time through.
Rainbow bubbles
After level 5, rainbow bubbles will begin to appear. They will match any adjacent color when included in a chain. You can continue that chain if you include another rainbow bubble. Use them carefully. If there are only a few bubbles of a different color next to them, save them until they end up between two large groups of bubbles. Note: Rainbow bubbles will not disappear if they are in the way of a super bubble.
Super bubbles
Some levels have objectives that may involve reaching a certain number of a specific bubble. Use super bubbles to get hard to reach bubbles. Super bubbles will pulse either horizontally or vertically to show how it will pop when activated. Either tap the super bubble or pop it in a chain and it will shoot a beam that will pop everything it passes through.