But I bought it anyway, because the point isn't to solve Sudoku puzzles, it's to show off how nifty this program is. Which is easily worth a buck.
Serious Sudoku players tend to scorn machine-generated puzzles and regard those build by Sudoku masters as superior. See for example http://www.nikoli.co.jp/en/puzzles/sudoku/hand_made_sudoku.h...
I believe similar arguments are made by crossword fans, though it is easier to understand why in that case.
So I can see the motivation for the application, at least.
http://www.techcrunch.com/2009/07/07/amazon-killing-mobile-a...