Most Sudoku apps give you a hint by filling in a cell. Swordfish Sudoku tells you why. Its solver works the way a strong human player does — scanning for naked singles, pointing pairs, X-wings, swordfish — and when you ask for a hint, it walks you through the technique that cracks the position.
Swordfish Sudoku runs entirely on your device and collects no data at all. Full details: Swordfish Sudoku privacy policy.
Questions or bug reports: support@iqstech.com.