困难 回文数独
沿每条标记线的数字正向和反向读法相同。每个回文都镜像其自身的逻辑。
困难 回文数独。更长的线和更少的已知数——期待级联回文链和仔细的 候选数标记 追踪。
3
8
9
6
7
9
2
4
7
8
2
1
2
6
5
1
7
7
8
1
8
4
5
8
2
3
4
什么是回文数独？
难度
★★★☆☆
3/5
约束类型
线条约束
典型给定数
20–28
平均解题 (困难)
32 分钟
困难 级别的解题技巧
| 技巧 | 描述 | 级别 |
|---|---|---|
| Mirror Pair Identification | In a palindrome of length L, cell i and cell L+1−i must share the same digit. Identify all mirror pairs before solving. | 初级 |
| Centre Cell Freedom | The central cell of an odd-length palindrome has no mirror constraint — it is only restricted by standard row/column/box rules. | 初级 |
| Mirror Propagation | Once one cell of a mirror pair is determined, immediately set its partner to the same value. | 中级 |
| Multi-Palindrome Intersection | If two palindromes share a cell, that cell must satisfy both palindrome relationships simultaneously. | 高级 |
准备好终极测试了吗?试试 专家 回文数独 — 数独 上最难的谜题。
在困难需要掌握的技巧
- Hidden Pairs technique — Hard palindrome grids overlap lines so a cell mirrors into two different partners — intersecting three candidate lists exposes pairs invisible to any single unit scan.
- X翼技巧 — An elimination at one mirror cell exports to a distant row, so fish patterns assemble in rows the palindrome line never touches — check mirrors after every X-Wing.
按难度划分的平均解题时间
简单
7 分钟
中等
16 分钟
困难
32 分钟
专家
58 分钟
想要规则、策略和解题步骤的完整指南吗？
如何玩回文数独 →
相关变体
连体数独
Both put structure on a drawn line's digit set — renban demands a consecutive run where palindromes demand mirror symmetry.
德国耳语
Trades mirrored repetition for forced separation: adjacent line digits must differ by 5 or more.
线间数独
Endpoint-anchored lines where position on the line carries meaning, just as it does for palindrome mirror pairs.
常见问题 — 困难 回文数独
更多问题？请参阅完整 回文数独指南.