Diagonal Sudoku
1
8
9
6
5
9
2
3
1
8
3
4
9
2
9
3
8
1
7
7
1
3
6
9
4
7
8
9
2
3
6
3
5
8
2
2
8
6
Erreurs
0/3
Score
-
Temps
00:00
Progrès0%
Facile · Sudoku Diagonal
Changez la difficulté ci-dessus ↑
Comment jouer au Sudoku Diagonal
Les règles standard du Sudoku s'appliquent : placez 1–9 dans chaque ligne, colonne et boîte 3×3. La règle supplémentaire : les deux diagonales surlignées (↘ et ↙) doivent également contenir chaque chiffre exactement une fois. La cellule centrale se trouve sur les deux diagonales, ce qui en fait la cellule la plus contrainte du plateau.
Guide complet →
Les deux diagonales principales doivent aussi contenir 1–9
Diagonal Sudoku Facile
Diagonal Sudoku Moyen
Diagonal Sudoku Difficile
Diagonal Sudoku Expert
Qu'est-ce que Diagonal Sudoku ?
Dans le Diagonal Sudoku, les règles standard 9×9 s'appliquent — mais avec une contrainte supplémentaire puissante : les deux diagonales principales (haut-gauche à bas-droite, et haut-droite à bas-gauche) doivent chacune contenir tous les chiffres de 1 à 9 exactement une fois. Cette contrainte supplémentaire rend généralement le puzzle plus facile à résoudre car les diagonales agissent comme deux unités supplémentaires pour l'élimination.
En un coup d'œil
| Type de contrainte | Régions supplémentaires |
| Indices typiques | 22–28 |
| Évaluation de la difficulté | ★★☆☆☆ 2/5 |
| Temps de résolution moyen — Facile | 4 min |
| Temps de résolution moyen — Moyen | 10 min |
| Temps de résolution moyen — Difficile | 20 min |
| Temps de résolution moyen — Expert | 40 min |
Comment résoudre Diagonal Sudoku
| Technique | Ce qu'il fait | Niveau |
|---|---|---|
| Diagonal as a Unit | Treat each diagonal exactly like a row or column — every digit 1–9 appears exactly once. Standard scanning and counting apply. | Avancé |
| Diagonal–Box Interaction | When a digit on a diagonal is confined to one box segment, eliminate it from the rest of that box. | Avancé |
| Diagonal Naked Pairs | If two cells on a diagonal share the same two candidates, eliminate those values from all other diagonal cells. | Avancé |
| Three-Unit Intersection | A cell on the main diagonal also belongs to a row, column, and box — four constraint units simultaneously — maximising elimination power. | Avancé |
Temps de résolution moyens
Facile
4 min
Moyen
10 min
Difficile
20 min
Expert
40 min
Foire aux questions
Qu'est-ce que Diagonal Sudoku ?
Diagonal Sudoku adds two extra constraints on top of standard Sudoku: both main diagonals of the 9×9 grid must each contain the digits 1–9 exactly once. This means every cell on either diagonal belongs to four uniqueness groups simultaneously: its row, column, box, and diagonal.
Which cells are on the diagonals?
The main diagonals run from the top-left corner to the bottom-right corner, and from the top-right corner to the bottom-left corner. Together they cover 17 cells (the centre cell is on both). Any cell at position (r, c) is on a diagonal if r equals c or if r + c equals 10 (using 1-based numbering).
How does the diagonal constraint help solving?
Diagonal cells carry four constraints instead of the usual three, making them the most restricted cells on the board. Whenever you place a digit anywhere on a diagonal, it eliminates that digit from the entire row, column, box, and the diagonal simultaneously — often triggering a cascade of placements.
Is Diagonal Sudoku harder than regular Sudoku?
At easy difficulty, Diagonal Sudoku is actually easier than equivalent classic Sudoku because the extra constraints eliminate more candidates immediately. At hard and expert levels, the diagonal interactions create subtler deductions that experienced players find more challenging to spot.
Can I solve Diagonal Sudoku using standard techniques?
Yes — all standard Sudoku techniques (naked pairs, hidden singles, pointing pairs, X-Wings, etc.) apply. You simply treat each diagonal as an additional house. The most important habit is scanning both diagonals after every placement, the same way you scan rows, columns, and boxes.
How long does Diagonal Sudoku take to solve?
Easy puzzles take 5–12 minutes — often faster than equivalent classic puzzles because of the extra constraints. Medium puzzles run 12–25 minutes. Hard and expert puzzles can take 30–70 minutes depending on how heavily the diagonal interactions need to be exploited.