There are no controls or major interface elements near the bottom so tapping an ad by accident is nearly impossible. Tapping the ad will launch the browser in a separate card and keep your game uninterrupted. The ad changes every time you tap a bubble, which can be a little distracting. You can turn off sounds for the game in case you’re playing in a library or other place with a need for silence. Unfortunately you can’t save the state of a game, you’ll just have to keep a card running if you are interrupted mid-game and need to come back to it at a later time. Overall, Bubbles is clean, simple, and relatively well-implemented. A worthwhile download that compares well with other implementations of the game on other smartphones.