Android - the mystery game

Puzzles are solved. Mysteries are revealed.

Even when you can't find the right answer [to solve a puzzle], you know it exists. Puzzles can be solved; they have answers.

But a mystery offers no such comfort. It poses a question that has no definitive answer because the answer is contingent; it depends on a future interaction of many factors, known and unknown.

                                                                - Gregory F. Treverton