Great for learning advanced solving techniques.

This is the best Sudoku app I have found on any platform. If you are serious about improving your Sudoku skills get this app. It will teach you advanced techniques that you won’t be able to figure out yourself.

Just a couple of negatives:
1) app design is very basic and reminds me of windows apps.
2) sometimes it is hard to understand the lessons - it often takes me 3-4 times before I can start using the new techniques myself.

Leo Horthy about (heart) Sudoku