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

每個標記線上的數字前後讀取相同。每個回文鏡像其自身邏輯。

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錯誤

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分數

時間

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難度

★★★☆☆

3/5

約束類型

線條約束

典型給定數

20–28

平均解題時間（簡單）

7分鐘

解題技巧：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.

依難度平均解題時間

簡單

7分鐘

中等

16分鐘

困難

32分鐘

專家

58分鐘

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常見問題 — 簡單回文數獨

什麼是 Palindrome Sudoku？

Palindrome Sudoku 是一種數獨變體，其中網格上繪有灰色線條。每條灰色線條都是一個回文——數字序列從前向後讀取相同。標準數獨規則仍然適用：每一行、列和 3x3 宮必須包含每個數字 1 到 9 恰好一次。

回文線是如何運作的？

灰色線上的數字必須形成palindrome。對於5個單元格的線，第一個單元格等於第五個，第二個單元格等於第四個。中間的單元格（第三個）不受palindrome規則約束——但仍必須遵守標準數獨的唯一性。

palindrome lines 能否互相重疊？

是的。兩條回文線可以共享格子。共享的格子必須同時滿足兩條線的回文約束，這可以急劇限制可以放置的數字。

我該如何開始解簡單的回文數獨？

先尋找最短的回文線——一條 2 格線意味著兩個格子相等，這結合行/列唯一性大大限制了可能性。也要尋找與許多給定數字共享行或列的回文端點。

Palindrome Sudoku與regular Sudoku有何不同？

Regular Sudoku 給你預先填好的數字作為提示。Palindrome Sudoku 通常有更少的提示，而是提供視覺線條約束。配對單元格之間的回文關係在標準唯一性之上增加了第二層約束。

還有問題？請參閱完整回文數獨指南.

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