Sereno Sudoku

Sereno Sudoku is Sudoku built for playing without rushing: large, clear digits, a clean design, and nothing to distract you from the board. Three difficulties, easy to hard, with a guaranteed unique solution, plus nonograms: two logic games in one app. Daily challenge with a monthly calendar and streak, notes with automatic clean-up, unlimited undo, and hints that show you the technique instead of just filling the cell. Three themes, light, sepia and dark, optional original music, and six languages. Works completely offline.

No lives, no energy, no waiting. No ads in the middle of a game: the only ad, if it shows at all, appears after you finish. Premium (optional, one-time purchase) removes ads, gives unlimited hints, and unlocks the dark theme. Family Sharing supported: buy it once and share it with your family.