This one is unique in the Android Market. And because you can play for free or buy for - I mean donate - 99 cents, I have to advise a test drive. Puzzle games like this drive me up the wall, and I usually end up searching for the walk-through. If that kind of frustration intrigues you, then you will not be disappointed.
Feel free to comment about how easy you found it. I think it's quite challenging, and well worth the dollar investment to see where this will go. The author calls it an "epic story," and I want to learn more. I am a sucker for creepy games. I don't know why, but I suddenly have the urge to play Fatal Frame. I need a first-gen xbox. They're like, 50 bux now.