To play, simply click and hold the left mouse button over the green bubbles to make them expand. The goal is to push the pair of blue bubbles to the blue circle located somewhere on the screen. If you touch the red circles, you have to start over, and green bubbles can't touch anything that looks pointy or they'll pop. Some levels allow you to create a limited number of new bubbles you can drop and expand at any time. Simply click on a blank portion of the screen to send it falling.
Analysis: Pile O'Bubbles features 25 levels of devishly devious bubble puzzles, some of which are so taxing you might want to borrow someone else's brain to spare yourself the headache. Use your own quick clicking skills, however, as most of the levels require you to act twice as fast as you can think. It's an intruiging combination of concepts that creates a marvelously compelling game.
The simple visuals in Pile O'Bubbles serve their purpose well, but the contrast becomes a bit straining on the eyes after some time. Thicker lines could alleviate the problem and make it easier to sit in for the marathon sessions of bubble piling you'll find yourself caught up in. The water bubbling sound effects are a nice touch!
Pile O'Bubbles is a great puzzle game that successfully blends action gameplay with a little thoughtful puzzle solving.