サムライ数独
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簡単 · サムライ · 5サブグリッド0%
サムライ数独の遊び方
5つの重なる9×9数独グリッド。各サブグリッドは独立して標準の数独ルール（各行、列、ボックスに1–9）を満たさなければなりません。2つのサブグリッドが3×3のコーナーボックスを共有する場合、そのボックスは両方のグリッドを同時に満たさなければなりません。
完全ガイド →
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
サムライ数独とは？
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。
概要
| 制約タイプ | 5 Overlapping Grids |
| 典型的な初期数字 | ~30 per sub-grid |
| 難易度評価 | ★★★★★ 5/5 |
| 平均解答時間 — 簡単 | 45分 |
| 平均解答時間 — ミディアム | 90分 |
| 平均解答時間 — 難しい | 150分 |
| 平均解答時間 — エキスパート | 240分 |
サムライ数独 の解き方
| テクニック | それが何をするか | レベル |
|---|---|---|
| Sub-Grid Independence | Each of the five 9×9 sub-grids satisfies standard Sudoku rules independently. Solve each one using all standard techniques. | 上級 |
| Overlap Box Exploitation | The four corner boxes where sub-grids meet are shared between two grids. Any digit placed in a shared box eliminates that digit from two sub-grids at once. | 上級 |
| Cross-Grid Cascade | Completing a corner box in the central grid forces values in the corresponding corner grid's box, which may cascade further through that grid. | 上級 |
| Shared Box Forcing | When a shared box is nearly complete, use both sub-grids' row and column constraints to force the remaining digits. | 上級 |
| Global Number Counting | Across all five sub-grids, each digit 1–9 appears 5×9=45 times total. This global count can confirm placement decisions near the end. | 上級 |
平均解答時間
簡単
45分
ミディアム
90分
難しい
150分
エキスパート
240分
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.