專家 回文數獨
每條標記線上的數字前後讀取相同。每個回文反映其自身邏輯。
專家 回文數獨。網站上最難的謎題——密集的回文網絡，每個放置都需要精確的多步驟推理。
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4
1
7
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7
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什麼是 回文數獨？
難度
★★★☆☆
3/5
約束類型
線條約束
典型給定數字
20–28
平均解題（專家）
58 分鐘
解謎技巧（專家 等級）
| 技巧 | 描述 | 等級 |
|---|---|---|
| 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. | 初學者 |
| 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. | 初學者 |
| Mirror Propagation | Once one cell of a mirror pair is determined, immediately set its partner to the same value. | 中級 |
| Multi-Palindrome Intersection | If two palindromes share a cell, that cell must satisfy both palindrome relationships simultaneously. | 進階 |
在 專家 需要掌握的技巧
- X翼技巧 — Expert palindrome endgames chain mirror-imported eliminations into fish: prune through the mirrors first, then the X-Wing geometry appears two boxes away.
- Swordfish technique — Long mirrored lines synchronise candidate patterns between far-apart rows, exactly the repetition a Swordfish needs — expert grids are constructed around this echo.
按難度劃分的平均解題時間
簡單
7 分鐘
中等
16 分鐘
困難
32 分鐘
專家
58 分鐘
想要規則、策略和解題步驟的完整解說？
如何遊玩 回文數獨 →
相關變體
Renban數獨
Both put structure on a drawn line's digit set — renban demands a consecutive run where palindromes demand mirror symmetry.
德語低語
Trades mirrored repetition for forced separation: adjacent line digits must differ by 5 or more.
線間數獨
Endpoint-anchored lines where position on the line carries meaning, just as it does for palindrome mirror pairs.
常見問題 — 專家 回文數獨
更多問題？請參閱完整 回文數獨指南.