Daily Sudoku Challenge — 2026-05-21 (Medium)
Warm up with the daily grid. Logic-only — no guessing required, just patience and pattern recognition.
| · | 6 | 4 | · | 2 | 1 | · | · | 3 |
| · | · | · | 4 | · | 6 | 5 | 1 | 7 |
| · | 1 | · | · | 3 | 8 | 2 | 6 | · |
| · | · | · | · | · | · | · | 4 | 2 |
| 6 | · | 7 | 2 | 8 | 4 | 1 | 5 | · |
| 4 | 8 | · | · | 1 | · | 3 | · | · |
| 2 | · | · | · | · | · | 7 | · | 8 |
| 8 | · | · | 6 | 7 | 2 | · | 9 | · |
| 9 | 7 | · | · | 4 | 3 | · | · | 5 |
Solving tips
- When stuck, restart your scan from the digit with fewest candidates.
- Scan rows, columns, and boxes for the most-frequent digit first.
- Pencil-mark candidates only when single-cell scanning stalls.