XV Sudoku is a Sudoku variant where small letters appear between adjacent cells. An X between two cells means those two digits sum to 10. A V between two cells means they sum to 5. Standard Sudoku rules still apply — every row, column, and 3x3 box must contain 1 through 9 exactly once. The XV markers give you extra constraints to work with.

What pairs of digits can form an X (sum to 10) in XV Sudoku?

The valid pairs that sum to 10 are: 1+9, 2+8, 3+7, and 4+6. Note that 5+5 is not valid because each digit must appear exactly once in each row, column, and box, making two 5s impossible in adjacent cells. When you see an X marker, the two cells must contain one of these four pairs.

What pairs of digits can form a V (sum to 5) in XV Sudoku?

The valid pairs that sum to 5 are: 1+4 and 2+3. Both pairs use small digits, which means V-marked cells are always filled with numbers from 1 to 4. When you see a V marker, immediately rule out any digit from 5 to 9 in both connected cells.

What does it mean when two adjacent cells have no X or V marker?

In XV Sudoku, the absence of a marker is meaningful. If two adjacent cells have no marker, they are guaranteed not to sum to 10 and not to sum to 5. This rules out the X-pair and V-pair combinations for those two cells, giving you extra elimination opportunities even in unmarked regions.

How do I start solving an easy XV Sudoku?

Start with V markers — they restrict cells to the narrow range 1-4, immediately eliminating five candidates from each connected cell. Then look at X markers adjacent to already-placed digits: if a cell is confirmed as 3 and has an X with its neighbor, the neighbor must be 7. Work from the most constrained cells outward.

簡單XV 數獨

X 標記和為 10 的格子；V 標記和為 5 的格子。所有未標記的相鄰對不得和為 5 或 10。

簡單中等困難專家

新手 XV 數獨？單元格之間的X表示它們的和為10；V表示和為5。從V標記開始——它們將單元格限制在1到4之間。

錯誤

0/3

分數

時間

00:00

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進度0%

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什麼是 XV 數獨？

難度

★★★☆☆

3/5

約束類型

儲存格關係

典型給定數

18–24

平均解題時間（簡單）

8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 XV 數獨以解鎖中級技巧。

在簡單需要掌握的技巧

Last Possible Number technique — A V-marked cell can only hold 1–4 and an X-marked cell can't hold 5 — apply the marker maths before row checks and most marked cells drop to two candidates.
Last Remaining Cell technique — The no-marker rule bans sum-10 and sum-5 partners on every unmarked edge, quietly removing legal cells until a digit has just one home in its unit.

依難度平均解題時間

簡單

8分鐘

中等

18分鐘

困難

35分鐘

專家

62分鐘

想要規則、策略和解題步驟的完整演練嗎？如何遊玩 XV 數獨 →

常見問題 — 簡單 XV數獨

什麼是 XV Sudoku？

XV Sudoku是一種數獨變體，其中小字母出現在相鄰單元格之間。兩個單元格之間的X表示這兩個數字之和為10。兩個單元格之間的V表示它們的和為5。Standard Sudoku規則仍然適用——每行、每列和每個3x3宮必須包含1到9各一次。XV標記為你提供了額外的約束條件。

在XV數獨中，哪些數字對可以形成X（和為10）？

和為10的有效對子是：1+9、2+8、3+7和4+6。注意5+5無效，因為每個數字必須在每個行、列和宮中恰好出現一次，使得相鄰單元格中不可能有兩個5。當你看到X標記時，兩個單元格必須包含這些對子之一。

在XV數獨中，哪些數字對可以形成V（和為5）？

和為5的有效對子是：1+4和2+3。兩個對子都使用小數字，這意味著V標記的單元格總是填充1到4的數字。當你看到V標記時，立即排除兩個連接單元格中5到9的任何數字。

當兩個相鄰單元格沒有 X 或 V 標記時，這意味著什麼？

在XV數獨中，標記的缺失是有意義的。如果兩個相鄰單元格沒有標記，則保證它們的總和不等於10也不等於5。這排除了這兩個單元格的X對和V對組合，即使在未標記的區域也給你額外的刪除機會。

我該如何開始解一個簡單的XV數獨？

從V標記開始——它們將單元格限制在1-4的狹窄範圍內，立即從每個相連的單元格中消除五個候選數字。然後查看與已放置數字相鄰的X標記：如果一個單元格被確定為3，並且與其鄰居有X，則該鄰居必須是7。從最受限制的單元格向外工作。

還有問題？請參閱完整 XV 數獨指南.