ジグソー数独
7
2
6
5
9
8
5
1
3
7
2
4
9
7
2
3
9
3
6
6
2
1
9
8
4
6
9
3
5
2
7
9
2
3
5
2
1
6
ジグソー数独の遊び方
標準の行と列のルールが適用されます。各色付き領域（太い枠線で囲まれています）にも1～9がちょうど1回ずつ含まれなければなりません。領域は標準の3×3ボックスに代わるものです。
完全ガイド →
不規則なジグソー形の領域が標準の3×3ボックスを置き換えます
ジグソー数独とは？
Jigsaw Sudoku（Irregular Sudokuとも呼ばれる）は、9つの標準的な3×3ボックスを9つの不規則なジグソー形状の領域に置き換えます。各領域は依然として9つのセルを含み、1から9までの各数字を正確に1回ずつ含まなければなりません。行と列のルールは変わりません。不規則な形状は、クラシックSudokuとは非常に異なる解法経路を生み出すことができます。
概要
| 制約タイプ | イレギュラー領域 |
| 典型的な初期数字 | 24–30 |
| 難易度評価 | ★★★☆☆ 3/5 |
| 平均解答時間 — 簡単 | 7分 |
| 平均解答時間 — ミディアム | 16分 |
| 平均解答時間 — 難しい | 32分 |
| 平均解答時間 — エキスパート | 60分 |
ジグソー数独 の解き方
| テクニック | それが何をするか | レベル |
|---|---|---|
| Region Identification First | Identify all 9 irregular regions by their colour coding before solving. Region membership determines the third constraint unit for each cell. | 上級 |
| Region Counting | Each region must contain 1–9. Counting completed rows and columns reveals how many of each digit can still fit in each region. | 上級 |
| Region–Row/Column Intersection | If a digit within a region is confined to one row or column, eliminate it from the rest of that row or column. | 上級 |
| Irregular Naked Subsets | Apply naked pairs and triples within each irregular region exactly as you would within standard 3×3 boxes. | 上級 |
平均解答時間
簡単
7分
ミディアム
16分
難しい
32分
エキスパート
60分
よくある質問
Irregular Sudokuとは何ですか？
Irregular Sudoku (also called Jigsaw Sudoku) replaces the standard nine 3×3 boxes with nine irregularly-shaped regions of exactly nine cells each. Every row, column, and irregular region must still contain the digits 1–9 exactly once. The regions are colour-coded or outlined with thick borders.
How do I identify the irregular regions?
Each region is shaded in a distinct colour or enclosed by thicker lines. Count the cells in each region to confirm it has exactly nine. The regions are always connected — no region is split across the grid — but they can have any shape as long as they tile the full 9×9 grid.
Is solving Irregular Sudoku different from classic Sudoku?
The logic is identical — you use the same techniques (naked pairs, hidden singles, pointing pairs, etc.) — but the non-rectangular region shapes create different constraint interactions. A region that snakes diagonally creates eliminations in many different rows and columns simultaneously, which can feel unintuitive at first.
Is Irregular Sudoku harder than regular Sudoku?
At easy difficulty, Irregular Sudoku can be harder because the region shapes are less predictable than 3×3 boxes. At higher difficulties, experienced Sudoku players often find it comparably challenging — the same techniques apply, just with different geometry.
What is the best strategy for Irregular Sudoku?
Trace each region carefully before starting — understand its shape and which rows and columns it spans. Regions that span many different rows and columns create more powerful constraints. Focus on regions with the most given digits first, then use pointing pairs to transfer information between regions and lines.
How long does Irregular Sudoku take to solve?
Easy puzzles take 8–20 minutes. Medium puzzles run 20–40 minutes. Hard and expert puzzles can take 45–90 minutes. Familiarity with jigsaw region shapes speeds up solving considerably after a few practice puzzles.