- Code: Select all
+-------+-------+-------+
| 1 2 3 | 4 . 5 | 6 . . |
| 7 . . | . . . | . . . |
| . . 8 | 9 . . | . . . |
+-------+-------+-------+
| . . 1 | 2 . 3 | . 4 . |
| . . . | . 5 . | . . . |
| . 6 . | 7 . 8 | 9 . . |
+-------+-------+-------+
| . . . | . . 1 | 2 . . |
| . . . | . . . | . . 3 |
| . . 4 | 5 . 6 | 7 8 9 |
+-------+-------+-------+
1234.56..7..........89.......12.3.4.....5.....6.7.89.......12..........3..45.6789
1 to 9 in order, once per band, and also rotationally symmetric. (This one is symmetrically minimal.)
And a bonus (very) easy one that I just liked the look of:
- Code: Select all
+-------+-------+-------+
| 1 . 2 | . . 3 | . . . |
| . . . | 4 . . | 5 . 6 |
| . 7 . | . 8 . | . 9 . |
+-------+-------+-------+
| . . 1 | . . 2 | . . 3 |
| . 4 . | . 5 . | . 6 . |
| 7 . . | 8 . . | 9 . . |
+-------+-------+-------+
| . 1 . | . 2 . | . 3 . |
| 4 . 5 | . . 6 | . . . |
| . . . | 7 . . | 8 . 9 |
+-------+-------+-------+
1.2..3......4..5.6.7..8..9...1..2..3.4..5..6.7..8..9...1..2..3.4.5..6......7..8.9
(This one isn't minimal, but does have an additional restriction of three givens in each row, column, and box. I generated all possible puzzles for this restriction, and the highest SER was 4.5. This one just happened to catch my eye since it doesn't have any adjacent givens.)