アウトサイド Sudoku
72
39
85
94
15
87
56
13
74
76
19
32
34
29
15
98
61
32
6
3
5
1
1
4
6
3
2
3
5
4
1
9
7
4
7
9
5
8
3
5
2
4
8
9
9
7
5
3
2
6
6
1
9
8
2
1
14
32
76
25
46
79
23
85
91
63
54
12
21
97
53
89
47
16
アウトサイド数独の遊び方
標準数独ルールが適用されます。グリッド外に示された各数字は、その行または列の最初の3セル（最も近い3x3ボックス）内に現れなければなりません。左/右の青い手がかりはその行の最初/最後の3セルを指し、上/下の青い手がかりはその列の最初/最後の3セルを指します。
完全ガイド →
Grid の外側の Digits は、その row または column の最初の 3 つの cells に現れなければなりません
アウトサイド Sudokuとは？
アウトサイド数独は、グリッドの余白に数字を配置します。各外部数字は、それが指す行または列の最初の3セル（最も近いブロック）のいずれかに現れなければなりません。グリッド内には標準的な与えられた数字はなく、すべてのヒントは余白から提供されます。これにより、初期の制約が完全にグリッド外から来るという珍しい形式の数独が生まれます。
概要
| 制約タイプ | アウトサイドヒント |
| 典型的な初期数字 | 28–36 given + 4×9 outside clues |
| 難易度評価 | ★★★☆☆ 3/5 |
| 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 | 36分 |
| 平均解答時間 — エキスパート | 65分 |
アウトサイド Sudoku の解き方
| テクニック | それが何をするか | レベル |
|---|---|---|
| Clue-Zone Mapping | Each outside digit must appear in the nearest 3 cells of its row or column. Map all outside clues to their zones immediately. | 上級 |
| Cross-Side Reasoning | If left clue digit X must be in cols 1–3, and right clue digit X is in the same row, that row already places X — the other side confirms its column. | 上級 |
| Box-Side Interaction | An outside clue for a row interacts with the box containing cols 1–3. If the row's box is heavily constrained, the outside digit's position may be forced. | 上級 |
| Digit Elimination from Clues | When a clue digit is placed in the zone, eliminate it from the rest of the zone row/col using standard Sudoku logic. | 上級 |
| Dual-Side Chains | Combine left and right clues for the same row: both digits restrict the same three columns from opposite ends, leaving the middle box fully determined. | 上級 |
平均解答時間
簡単
8分
ミディアム
18分
難しい
36分
エキスパート
65分
よくある質問
Outside Sudokuとは何ですか？
Outside Sudoku is a variant where digits appear outside the grid's borders, one or more per row and per column. Each outside digit must appear somewhere within the first three cells of the row or column it points into (the nearest three to that outside clue). Standard Sudoku rules apply throughout.
How far into the grid do outside clues reach?
Each outside clue constrains only the first three cells of its row or column — the three cells nearest to where the clue is placed. A clue on the left side of row 5 means that digit must be in column 1, 2, or 3 of row 5. A clue on the top of column 4 means that digit must be in row 1, 2, or 3 of column 4.
Can an outside digit appear in any of the three cells?
Yes — the clue only guarantees the digit is somewhere in those first three cells, not which one. When multiple outside clues constrain the same three-cell window, their interactions can pin specific cells very precisely. Cross-referencing horizontal and vertical outside clues is the primary solving technique.
Is Outside Sudoku hard to learn?
The rule is simple but the deductions require careful accounting of which digits must appear in which windows. Easy puzzles are accessible for Sudoku players of all levels. Harder puzzles demand systematic tracking of all outside constraints simultaneously across every border.
What is the best first move in Outside Sudoku?
Find rows or columns where outside clues constrain all three cells in the first window. If three different clues each point to the same window, those three cells are fully determined in terms of which digits they contain (though not necessarily in which order). This is the fastest path to early placements.
How long does Outside Sudoku take to solve?
Easy puzzles take 8–18 minutes. Medium puzzles run 18–35 minutes. Hard puzzles average 35–65 minutes and expert puzzles can exceed 90 minutes. The key variable is how many outside clues are provided and how tightly they constrain each three-cell window.