Bubble shooter is an aged game genre, so it's hard to impress with another bubble clone. However, Smarty Bubbles 2 is top quality and is definately worth a try!
In order to complete a level, you need to shoot a star bubble, this one:
Remember, the shot bubble bounces off the walls; exploit this to your advantage!
Be sure to keep an eye one the color of the next bubble, it's shown right next to the one you are about to shoot:
Enjoy the sweet pops :)