Difficile Sandwich Sudoku
Les indices à l'extérieur de la grille donnent la somme des chiffres pris en sandwich entre le 1 et le 9 dans chaque ligne et colonne.
Difficile Sandwich Sudoku. Moins d'indices de somme extrême — recouper les contraintes de sandwich de ligne et de colonne pour localiser 1 et 9 est essentiel.
32
6
4
8
21
3
15
22
23
32
28
0
26
13
7
25
0
27
6
1
4
8
5
9
7
7
8
8
2
4
1
9
6
5
4
2
9
8
3
1
4
2
4
3
8
Erreurs
0/3
Score
-
Temps
00:00
Progrès0%
Difficile · Sandwich Sudoku
Comment jouer au Sudoku Sandwich →
Qu'est-ce que Sandwich Sudoku ?
Difficulté
★★★★☆
4/5
Type de contrainte
Indices extérieurs
Indices typiques
4–10 clue values
Moy. Résolution (Difficile)
52 min
Techniques de résolution pour le niveau Difficile
| Technique | Description | Niveau |
|---|---|---|
| Clue 0 Means Adjacent 1 and 9 | A sandwich clue of 0 means 1 and 9 are side-by-side with nothing between them. Place this pair immediately. | Débutant |
| Clue 35 Means 1 and 9 at Ends | A clue of 35 = 2+3+4+5+6+7+8. All middle digits are sandwiched, placing 1 and 9 at the two ends of the row/column. | Débutant |
| Position Enumeration | For each clue, enumerate all valid positions of 1 and 9 such that the enclosed digits sum to the clue. Cross-reference with column clues. | Intermédiaire |
| Sandwich Intersection | Row and column clues intersect at one cell. Combining row positions of 1 and 9 with column positions pinpoints key placements. | Avancé |
| Digit Forcing from Both Sides | Use clues from both the row and column sides to triangulate the positions of 1 and 9 simultaneously. | Intermédiaire |
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Techniques à maîtriser au niveau Difficile
- Hidden Pairs technique — With almost no givens, candidates stay wide except where sum arithmetic bites — recount cells adjacent to resolved crusts, where hard sandwich grids hide their pairs.
- Technique X-Wing — The whole variant revolves around locating 1 and 9, so fish on exactly those digits: an X-Wing on 9 collapses crust possibilities in two rows and two columns at once.
Temps de résolution moyen par difficulté
Facile
12 min
Moyen
26 min
Difficile
52 min
Expert
85 min
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Comment jouer à Sandwich Sudoku →
Variantes connexes
Killer Sudoku
Both are sum-deduction puzzles at heart — killer's 45 rule and sandwich's crust sums exercise the same arithmetic.
Skyscraper Sudoku
Outside clues again, but read as building visibility instead of sums — the same edge-of-grid deduction style.
Sudoku Extérieur
The gentlest outside-clue cousin: border digits simply belong in the nearest three cells, no arithmetic required.
Foire aux questions — Difficile Sudoku Sandwich
Plus de questions ? Voir la Guide du Sandwich Sudoku.