Pipe Dream by thumbcountry.com in a nutshell is amusing.  Definitely something that can help you waste time but not a spectacular game by any stretch.

Test your sense of balance! Marbles are loaded into pipes of different shapes and positions. Tilt your iPhone so the marbles will roll out of the pipes and fall into the catching plates below. Your goal is to make sure each plate ends up with the same number of marbles after all marbles have been rolled out.  Start slow to get familiar with the speed and tilting angle. Pipes will become more slippery as your level increases so the marbles will roll faster as you progress. You can earn more life line as you advance.

I will admit the game is challenging.  Trying to get the marbles on catching plate is easy in the first round but as they add marbles it really gets difficult.  So if you like a challenge give the lite version a try for free.  If you really dig it go ahead and spend the .99 cents and get the full featured version.

iTunes App Store Link .99 Cents