Folio Nine: Sudoku

A little order. Every day. Folio Nine is your Sudoku journal: a quiet place to think, explore possibilities and enjoy the satisfaction of a finished grid. Warm paper tones, crisp typography and a focused board give the classic number puzzle a fresh editorial feel. PLAY AT YOUR PACE Choose Easy, Medium, Hard or Expert, with fewer starting clues as you move up. Every generated puzzle is checked to have exactly one solution. Start a new grid whenever you want, or return to your saved puzzle. YOUR DAILY MOMENT Open a daily puzzle based on your device's local date. Build a daily streak and revisit today's edition. Everything works offline, including the daily puzzle. ROOM TO THINK • Pencil in possible numbers with notes. • Undo moves and recover previous notes. • Erase entries without changing the original clues. • Highlight related cells and matching numbers. • Choose automatic mistake checking or a gentler approach. • Reveal a correct number with a free hint whenever you need one. A JOURNAL OF PROGRESS See your completed grids, daily streaks and best times for each difficulty. Unassisted best times are recorded for games finished without hints. Daily replays count once per date. DESIGNED FOR REAL LIFE Your puzzle saves automatically. Leave and return when you are ready. Pause to hide the board and stop the timer, rotate your screen, or switch to the Midnight paper theme for an evening session. Keyboard controls and descriptive cell labels offer additional ways to play. QUIET BY DESIGN No ads. No accounts. No in-app purchases. No internet connection required. Folio Nine has no trackers or analytics, and your progress stays on your device. Whether you have a few minutes or time for a deeper challenge, turn a fresh page with Folio Nine.