In this game you are facing grid of bubbles, which you need to remove to proceed to next level.
There are 2 game types available at the moment.
Arcade type is normal game where you pop bubbles in numbers of two or more.
Time trial is time based game where new bubbles will appear for the certain duration of time, it's more strategic and you have to plan in front how you set up bubbles so you can finish level.
It's highly addictive and fun game. In the end you can publish your score worldwide and compete with thousands of other people around the world.