イレギュラーダイアゴナル数独
9
4
6
5
6
2
6
8
2
9
1
4
7
4
8
5
4
2
9
6
1
1
3
8
3
5
2
8
1
7
1
8
3
7
6
9
1
3
イレギュラーダイアゴナル数独の遊び方
各行、列、色付き領域、および両方の主対角線（琥珀色で強調表示）は、1～9の各数字を正確に1回ずつ含ま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 →
ジグソー領域と主対角線の制約を組み合わせます
イレギュラーダイアゴナル数独とは？
不規則対角線数独は、2つのバリアントタイプを組み合わせます：ジグソー数独の不規則なジグソー領域とダイアゴナル数独の対角線制約です。両方の主対角線とすべての不規則領域は1～9を含む必要があります。この組み合わせは、高度に制約されたパズルと独自の解法ロジックを生み出します。
概要
| 制約タイプ | Combined: Irregular + Diagonal |
| 典型的な初期数字 | 22–30 |
| 難易度評価 | ★★★★☆ 4/5 |
| 平均解答時間 — 簡単 | 8分 |
| 平均解答時間 — ミディアム | 18分 |
| 平均解答時間 — 難しい | 35分 |
| 平均解答時間 — エキスパート | 65分 |
イレギュラーダイアゴナル数独 の解き方
| テクニック | それが何をするか | レベル |
|---|---|---|
| Map All 29 Units First | You have 9 rows + 9 columns + 9 irregular regions + 2 diagonals = 29 constraint units. Identify all irregular regions and both diagonals before starting. | 上級 |
| Diagonal–Region Intersection | Cells on a diagonal that also sit in the same irregular region create a powerful two-unit intersection — use both constraints simultaneously. | 上級 |
| Diagonal Pointing Pairs | If a digit on a diagonal is confined to one irregular region, eliminate it from all other cells of that region. | 上級 |
| Region Coloring for Diagonals | Trace which irregular regions each diagonal passes through. Regions with many diagonal cells are the most constrained. | 上級 |
| Chain Deduction Across Units | With 29 units, a forced digit in one unit often cascades through 3–4 other units. Track chains carefully to avoid errors. | 上級 |
平均解答時間
簡単
8分
ミディアム
18分
難しい
35分
エキスパート
65分
よくある質問
Irregular Diagonal Sudokuとは何ですか？
Irregular Diagonal Sudoku combines two variants: irregular jigsaw-shaped regions replace the standard 3×3 boxes, and both main diagonals of the 9×9 grid must each contain 1–9 exactly once. Cells on a diagonal therefore belong to four groups: row, column, jigsaw region, and diagonal. It is one of the most constraint-dense variants available.
How many constraint groups does a diagonal cell belong to?
A cell on one of the main diagonals belongs to four groups simultaneously: its row, its column, its jigsaw region, and its diagonal. The centre cell belongs to five groups — both diagonals, plus row, column, and region. This extreme constraint density makes every placement very powerful.
Is Irregular Diagonal Sudoku the hardest variant?
It is among the most constrained variants. The combination of irregular regions and diagonal constraints means almost every cell interacts with an unusually large portion of the grid. Expert puzzles in this variant are among the most demanding logic puzzles on the site.
What order should I tackle the constraints?
Start with the diagonals, since diagonal cells carry the most constraints. Find hidden singles on each diagonal first. Then scan the jigsaw regions, keeping diagonal eliminations active. Update all four constraint groups — row, column, region, diagonal — after every single placement.
Can I use standard Sudoku techniques?
Yes — all standard techniques apply. You simply treat each diagonal as an additional house alongside the nine rows, nine columns, and nine jigsaw regions. The diagonal pointing pair (where a digit in a diagonal is confined to one row or column) is a particularly powerful technique unique to diagonal variants.
How long does Irregular Diagonal Sudoku take to solve?
Easy puzzles take 10–20 minutes. Medium puzzles run 20–40 minutes. Hard puzzles average 40–75 minutes and expert puzzles often exceed 90 minutes. The combined constraint density means that even easy puzzles require tracking four constraint groups simultaneously.