サムライ数独 の遊び方
5つの重なり合う9×9グリッドがコーナーボックスを共有している
ルール
標準の数独ルールが適用されます： すべての行、列、3×3ボックスに数字1～9を、それぞれが1回ずつ現れるように埋めます。
Samurai Sudoku は、X 字型に配置された5つの連動する 9×9 グリッドで構成されます。1つの中央グリッドと4つの隅のグリッドがあり、すべてが重なる 3×3 ボックスを共有します。5つのサブグリッドはそれぞれ独立して標準の Sudoku ルールを満たさなければなりません。1つのサブグリッドを解くことで、別のサブグリッドを解く手がかりが得られることがよくあります。パズル全体は 21×21 のグリッドに及びます。
このパズルの出典、関連バリアントとの比較、戦略の概要については、私たちの サムライ数独バリアント概要.
概要
サムライ数独 の解き方
よくある質問
Samurai Sudokuとは何ですか？ ▾
Samurai Sudoku is a variant consisting of five overlapping 9×9 Sudoku grids arranged on a 21×21 board. One grid occupies the centre, and four grids are placed at the corners with their inner 3×3 boxes overlapping the centre grid's corner boxes. All five grids must be solved simultaneously.
How do the overlapping boxes work? ▾
Each of the four outer grids shares one 3×3 box with the centre grid. Any digit placed in a shared box satisfies the constraint for both grids simultaneously. This means information flows between grids through the shared boxes — solving one grid's corner often directly advances the centre grid.
Do all five grids have standard Sudoku rules? ▾
Yes. Each of the five 9×9 grids individually follows all standard Sudoku rules: every row, column, and 3×3 box within that grid must contain 1–9 exactly once. The only interaction between grids is through the shared corner boxes.
Is Samurai Sudoku harder than regular Sudoku? ▾
Samurai puzzles take significantly longer than single-grid Sudoku simply due to scale — you're solving five grids. Individual difficulty can range from easy to expert. The cross-grid interactions through shared boxes add a satisfying extra layer that single-grid Sudoku doesn't offer.
What is the best approach to Samurai Sudoku? ▾
Work on all five grids simultaneously rather than trying to complete one before moving to another. When you get stuck on one grid, the shared boxes often provide a breakthrough from a neighbouring grid. Scan all five grids for hidden singles after every placement in any shared box.
How long does Samurai Sudoku take to solve? ▾
Easy puzzles take 25–45 minutes. Medium puzzles run 45–90 minutes. Hard and expert puzzles can take 2–4 hours. The time is primarily driven by scale — five full grids — rather than by individual deduction difficulty.