Introducing Aqueduct—a world of jumbled waterways and mixed up pipelines. It's up to you to rearrange the tracks and restore the flow. 

Aqueduct 101 is a free introduction to the basics of this puzzling waterworks world. With 48 newly-crafted puzzles not found in the full version, you'll learn to master the various contraptions and concepts of Aqueduct. 

Locked gates, shifty conveyor belts, floating bridges, and more stand between you and order. Can you reconnect the waterways and pass Aqueduct 101? 

From the creators of Orba, Abca, and Enso•Dot—Aqueduct fuses the slider-puzzle and pipe-connecting concepts into something totally new and outlandishly clever. If you're bored of the same old puzzle games, Aqueduct will give your brain the challenge it's looking for.

Source: http://itunes.apple.com/us/app/aqueduct-101/id402516081?mt=8