The question
| 1 | 4 | ||
| 4 | |||
| 1 | 4 | ||
| 4 | 1 |
Digits 1–4 must appear once in each row and column.
Mini Sudoku
A 4×4 grid needing every digit once per row and column.
A 4×4 grid needing every digit once per row and column.
| 1 | 4 | ||
| 4 | |||
| 1 | 4 | ||
| 4 | 1 |
Digits 1–4 must appear once in each row and column.