Easy:
- Code: Select all
+-------+-------+-------+
| . . . | . . 3 | . 9 . |
| 3 . . | . . . | . . 1 |
| . 6 1 | 9 . 8 | 2 . . |
+-------+-------+-------+
| . . 8 | . . . | . . . |
| . . . | 7 . 1 | . . . |
| 5 . 9 | . . . | 4 . . |
+-------+-------+-------+
| . . 7 | 3 . . | 5 2 . |
| 2 . . | . . 6 | . . 4 |
| . 3 . | . . . | . . . |
+-------+-------+-------+
A little harder:
- Code: Select all
+-------+-------+-------+
| . . . | . . 3 | . 9 . |
| 3 . . | . . . | . . 1 |
| . 6 1 | 9 . 8 | 2 . . |
+-------+-------+-------+
| . . 8 | . . . | . . . |
| . . . | 1 . 7 | . . . |
| 5 . 9 | . . . | 4 . . |
+-------+-------+-------+
| . . 7 | 3 . . | 5 2 . |
| 2 . . | . . 6 | . . 4 |
| . 3 . | . . . | . . . |
+-------+-------+-------+
A lot harder:
- Code: Select all
+-------+-------+-------+
| . . . | . . 3 | . 9 . |
| 3 . . | . . . | . . 1 |
| . 6 1 | 9 . 8 | 2 . . |
+-------+-------+-------+
| . . 8 | . . . | . . . |
| . . . | 2 . 1 | . . . |
| 5 . 9 | . . . | 4 . . |
+-------+-------+-------+
| . . 7 | 3 . . | 5 2 . |
| 2 . . | . . 6 | . . 4 |
| . 3 . | . . . | . . . |
+-------+-------+-------+
What is the maximum number of valid Sudokus that can be made in this mold -- identical placement of givens, all but two givens identical in all puzzles?