SOLO-005 · Diagonal Sudoku
EXPERTThe Two Crossings
Complete the grid completely. Only one solution respects all constraints.
Materials: Pencil and gum; no commercial material.
Rules you need
- Fill in the 81 boxes with numbers from 1 to 9. Each row and column contains each of the nine digits exactly once.
- The coordinates L1C1 to L9C9 are read from the top left corner. No calculation is made on the coordinates numbers.
- Each of the nine blocks of 3 × 3 also contains numbers 1 to 9 without repetition.
- The two large diagonals each contain numbers 1 to 9 without repetition. This constraint adds to the blocks.
The puzzle
The empty boxes are to be completed. The given numbers are fixed. The answer and proof are on another page.
| L / C | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | ||||||||
| 2 | 9 | 3 | 7 | ||||||
| 3 | 4 | 5 | 8 | ||||||
| 4 | 7 | 4 | 6 | ||||||
| 5 | 1 | ||||||||
| 6 | 3 | ||||||||
| 7 | 5 | 9 | 4 | ||||||
| 8 | 4 | ||||||||
| 9 | 7 | 3 |
Your workspace
Write down your assumptions separately from deductions you have proved.