困難對角線數獨
兩條主對角線也必須包含1–9且不重複。四個單元而非三個——約束密度加倍。
困難 對角線數獨。對角線 X-Wings，多重限制宮交集，以及深度刪除鏈——鉛筆標記是必要的。
9
5
3
7
6
5
3
4
7
9
6
3
4
7
1
7
5
4
2
9
4
1
6
2
6
9
5
什麼是 對角線數獨？
難度
★★☆☆☆
2/5
約束類型
額外區域
典型給定數
22–28
平均解題時間（困難）
20分鐘
解題技巧：困難 等級
| 技巧 | 描述 | 等級 |
|---|---|---|
| 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. | 初學者 |
| Diagonal–Box Interaction | When a digit on a diagonal is confined to one box segment, eliminate it from the rest of that box. | 中級 |
| Diagonal Naked Pairs | If two cells on a diagonal share the same two candidates, eliminate those values from all other diagonal cells. | 中級 |
| Three-Unit Intersection | A cell on the main diagonal also belongs to a row, column, and box — four constraint units simultaneously — maximising elimination power. | 進階 |
準備好終極測試了嗎？試試 專家 對角線數獨 — 數獨 上最難的謎題。
在 困難 需要掌握的技巧
- Hidden Pairs technique — With four houses squeezing every diagonal cell, two digits frequently get cornered into the same two cells of a diagonal — check both diagonals for hidden pairs first.
- X-Wing 技巧 — An X-Wing whose corner lands on a main diagonal also strips that digit from the rest of the diagonal, turning a two-column elimination into a three-house sweep.
依難度平均解題時間
簡單
4分鐘
中等
10分鐘
困難
20分鐘
專家
40分鐘
想要規則、策略和解題步驟的完整演練嗎？
如何遊玩 對角線數獨 →
相關變體
不規則對角線數獨
Keeps both diagonal houses you've learned to scan and adds jigsaw regions for an even denser constraint web.
Hyper數獨
The same extra-region idea — four shaded windows instead of two diagonals — so your habit of scanning bonus houses transfers directly.
拼圖數獨
If you enjoy adapting your scan to new house shapes, jigsaw regions stretch that skill further than straight diagonal lines.
常見問題 — 困難 對角線數獨
還有問題？請參閱完整 對角線數獨指南.