As a student, I've had the problem of looking through a textbook searching for that one paragraph of useful information I saw earlier, and not being able to find it. This was my solution. It uses OCR to search for text in real time, and instantly highlights the results, so you don't need to sit around trying to find that one bit of useful text.

Go with the Flow. Simple, relaxing, addictive, and free. Tilt your device left and right to move sideways, and stay on the path for as long as you can. The higher score you get, the faster the flow will move. Try to score 2400!