What is Palindrome Sudoku?

Palindrome Sudoku is a Sudoku variant where grey lines are drawn on the grid. Each grey line is a palindrome — the sequence of digits reads the same forward and backward. Standard Sudoku rules still apply: every row, column, and 3x3 box must contain each digit 1 through 9 exactly once.

How do palindrome lines work?

The digits along a grey line must form a palindrome. For a 5-cell line, the first cell equals the fifth, and the second cell equals the fourth. The middle cell (third) is unconstrained by the palindrome rule — but still must obey standard Sudoku uniqueness.

Can palindrome lines overlap with each other?

Yes. Two palindrome lines can share cells. A shared cell must satisfy the palindrome constraint of both lines simultaneously, which can sharply restrict what digit can go there.

How do I start solving easy Palindrome Sudoku?

Find the shortest palindrome lines first — a 2-cell line means both cells are equal, which combined with row/column uniqueness greatly limits possibilities. Also look for palindrome endpoints that share rows or columns with many given digits.

How is Palindrome Sudoku different from regular Sudoku?

Regular Sudoku gives you pre-filled digits as clues. Palindrome Sudoku typically has fewer givens and instead provides visual line constraints. The palindrome relationship between paired cells adds a second layer of constraint on top of standard uniqueness.

簡單回文數獨

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。

簡單中等困難專家

新接觸回文數獨？每條灰色線在兩個方向上讀取相同。從最短的線開始以快速取勝。

錯誤

0/3

分數

時間

00:00

試試中等回文數獨 →

進度0%

簡單 · 回文數獨如何遊玩回文數獨 →

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（簡單）

7 分鐘

解謎技巧（簡單等級）

技巧	描述	等級

準備好更深入了嗎？試試中等回文數獨以解鎖中級技巧。

在簡單需要掌握的技巧

Last Remaining Cell technique — Every placement on a grey line is two placements — the mirror cell fills with the same digit, often completing a unit at the far end of the grid.
Last Possible Number technique — A line cell inherits all of its mirror partner's eliminations: intersect both cells' row, column, and box exclusions and many palindrome cells reduce to one digit.

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 →

常見問題 — 簡單回文數獨

乜嘢係Palindrome Sudoku？

回文數獨係一種數獨變體，其中灰色線畫喺網格上。每條灰色線係一個回文——數字序列向前同向後讀都一樣。標準數獨規則仍然適用：每行、每列同每個3x3宮必須包含1到9每個數字剛好一次。

palindrome lines如何運作？

灰色線上的數字必須形成回文。對於一條5格線，第一個格子等於第五個，第二個格子等於第四個。中間的格子（第三個）不受回文規則約束——但仍須遵守標準數獨的唯一性。

回文線可以相互重疊嗎？

是的。兩條 palindrome lines 可以共享單元格。一個共享單元格必須同時滿足兩條線的 palindrome constraint，這可以急劇限制可以放置的數字。

我如何開始解簡單的Palindrome Sudoku？

首先尋找最短的 palindrome lines——一個 2-cell line 意味著兩個 cells 相等，這 combined with row/column uniqueness 大大 limits possibilities。也尋找 palindrome endpoints 與許多 given digits 共享 rows 或 columns。

回文數獨與常規數獨有何不同？

常規數獨俾你預填數字作為提示。回文數獨通常有更少給定數字，反而提供視覺線限制。配對單元格之間嘅回文關係喺標準唯一性之上加多一層限制。

更多問題？請參閱完整回文數獨指南.

簡單 回文數獨

新接觸 回文數獨？每條灰色線在兩個方向上讀取相同。從最短的線開始以快速取勝。

什麼是 回文數獨？

解謎技巧（簡單 等級）

在 簡單 需要掌握的技巧