困難三明治數獨
網格外側的提示給出每行每列中夾在1和9之間的數字總和。
困難 Sandwich數獨。更少的極端和線索——交叉參考行和列三明治限制以定位1和9是必要的。
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
什麼是 Sandwich數獨？
難度
★★★★☆
4/5
約束類型
外部線索
典型給定數
4–10 clue values
平均解題時間（困難）
52分鐘
解題技巧：困難 等級
| 技巧 | 描述 | 等級 |
|---|---|---|
| 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. | 初學者 |
| 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. | 初學者 |
| 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. | 中級 |
| Sandwich Intersection | Row and column clues intersect at one cell. Combining row positions of 1 and 9 with column positions pinpoints key placements. | 進階 |
| Digit Forcing from Both Sides | Use clues from both the row and column sides to triangulate the positions of 1 and 9 simultaneously. | 中級 |
準備好終極測試了嗎？試試 專家 Sandwich數獨 — 數獨 上最難的謎題。
在 困難 需要掌握的技巧
- 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.
- X-Wing 技巧 — 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.
依難度平均解題時間
簡單
12分鐘
中等
26分鐘
困難
52分鐘
專家
85分鐘
想要規則、策略和解題步驟的完整演練嗎？
如何遊玩 Sandwich數獨 →
相關變體
殺手數獨
Both are sum-deduction puzzles at heart — killer's 45 rule and sandwich's crust sums exercise the same arithmetic.
Skyscraper數獨
Outside clues again, but read as building visibility instead of sums — the same edge-of-grid deduction style.
外部數獨
The gentlest outside-clue cousin: border digits simply belong in the nearest three cells, no arithmetic required.
常見問題 — 困難 三明治數獨
還有問題？請參閱完整 Sandwich數獨指南.