Try to group bubbles with the same color together. Groups with three or more bubbles of the same color will disappear and your score will InCrease.
If you cannot form a group of at least three similar bubbles you will lose one of the grey bubbles in the bottom left corner.
As soon as you lost all of them, new bubbles will be inserted at the top and you will Get five new grey bubbles.
When a bubble has no connection to the top row of bubbles anymore it will disappear, too. For these unconnected bubbles you get extra points.
If you manage to disconnect a large group of bubbles you will get an extra bonus of 10000 points!
And finally, if you are smart (and lucky) enough and you can get rid of all the bubbles your score will double!