Grafite Sudoku
Printable Jigsaw Sudoku #4
28 given numbers, medium level. At some point you need techniques beyond singles: write pencil marks.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 4 | 3 | 9 | |||||
| 2 | 3 | 2 | 7 | ||||||
| 3 | 8 | 7 | 4 | ||||||
| 4 | 7 | 9 | 3 | 4 | |||||
| 5 | |||||||||
| 6 | 4 | 8 | 3 | 5 | |||||
| 7 | 5 | 6 | 9 | ||||||
| 8 | 4 | 5 | 2 | ||||||
| 9 | 2 | 8 | 1 | 3 |
Print on A4 or Letter paper without resizing. The solution is on page 2.
Show the solution
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 6 | 7 | 1 | 4 | 3 | 5 | 9 | 8 |
| 2 | 5 | 4 | 3 | 9 | 2 | 8 | 7 | 6 | 1 |
| 3 | 8 | 9 | 1 | 5 | 7 | 6 | 3 | 4 | 2 |
| 4 | 6 | 1 | 5 | 7 | 9 | 2 | 8 | 3 | 4 |
| 5 | 7 | 3 | 9 | 4 | 8 | 1 | 6 | 2 | 5 |
| 6 | 4 | 8 | 2 | 6 | 3 | 5 | 9 | 1 | 7 |
| 7 | 3 | 5 | 8 | 2 | 6 | 4 | 1 | 7 | 9 |
| 8 | 1 | 7 | 4 | 3 | 5 | 9 | 2 | 8 | 6 |
| 9 | 9 | 2 | 6 | 8 | 1 | 7 | 4 | 5 | 3 |
Where to start
Look at row 5, column 5: only one number fits there.
The rules
Every row and every column contains 1 to 9. Instead of 3×3 boxes there are nine regions with thick borders: each of them also contains 1 to 9.
Tips for solving it
- Trace the region borders with your pencil: seeing them clearly is half the work.
- Count cells: regions that stick into a row or column tell you which numbers are left for the other cells.
- A long, narrow region touches many rows: its numbers fall into place early.
- Remember that rows and columns still work as in the classic: do not forget them while looking at the shapes.