OK, but ...

The most difficult puzzles ("Extreme") are only available in the paid version, so I upgraded. However, I have been disappointed. First, it appears that there are a limited number of starting patterns for Extreme puzzles (and they are all diagonally symmetrical). Although the numbers are filled in differently each time, the puzzles feel repetitive. Second, the difficultly level seems inconsistent. Some of the Extreme puzzles seemed only moderately hard, while some could only be completed by guessing and looking for an inconsistency. There are good features, such as the interface and the capture function, so this is a good first Sudoku app. But if you are looking for really challenging puzzles, you may find it disappointing.

nmg1217 about Sudoku Magic - The Puzzle Game, v2.3.2