- Code: Select all
+-------+-------+-------+
| 6 . . | . 5 . | . . 9 |
| . 1 . | 2 3 4 | . 5 . |
| . . 2 | . 8 . | 1 . . |
+-------+-------+-------+
| 2 . . | . 6 . | . . 4 |
| . . 5 | 3 . 2 | 9 . . |
| 8 . . | . 9 . | . . 7 |
+-------+-------+-------+
| . . 4 | . . . | 7 . . |
| . 8 . | . . . | . 4 . |
| 9 . . | . . . | . . 1 |
+-------+-------+-------+
6...5...9.1.234.5...2.8.1..2...6...4..53.29..8...9...7..4...7...8.....4.9.......1
(source: Sudoku Architect)