スカク
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スカクの遊び方
すべてのセルは、ペンシルマークとして表示された候補数字のセットから始まります。数字を押すと、選択したセルからその候補が除外されます。候補が1つだけ残ると、数字が自動的に配置されます。単一の大きな数字を表示しているセルは固定されており、変更できません。標準の数独の行、列、ボックスのルールが適用されます。
完全ガイド →
候補セットとして手がかりが与えられるペンシルマークスタイルのバリアント
スカクとは？
Sukaku (数角)は、与えられた数字の代わりに各セルに可能な候補のセットが与えられるSudokuのバリエーションです。ソルバーは標準的なSudokuロジックを使用して候補を排除し、各セルにちょうど1つの候補が残るまで行います。一部のSukakuパズルは非常に疎な候補セット（ほぼ完全なギブン）を提供し、他のものは完全またはほぼ完全な候補リストを提供し、高度なテクニックを必要とします。
概要
| 制約タイプ | Pencilmark Elimination |
| 典型的な初期数字 | All candidates shown |
| 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 | 35分 |
| 平均解答時間 — エキスパート | 62分 |
スカク の解き方
| テクニック | それが何をするか | レベル |
|---|---|---|
| Candidate Scanning | Start by scanning rows, columns, and boxes — any candidate appearing in only one cell in a group must be placed there. | 上級 |
| Cross-Hatch Elimination | When a digit is placed (or reduced to one candidate), eliminate it from all cells in the same row, column, and box. | 上級 |
| ネイキッドシングル | A cell with only one remaining candidate is a naked single — the digit is forced. In Sukaku, this happens automatically when you eliminate down to one candidate. | 上級 |
| 隠れシングル | A candidate that appears exactly once in a row, column, or box must be placed in that cell regardless of how many other candidates that cell shows. | 上級 |
| Pair Elimination | Two cells in a group that share only the same two candidates form a naked pair — both candidates can be eliminated from all other cells in that group. | 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
62分
よくある質問
What is Sukaku?
Sukaku is a Sudoku variant where every cell in the 9×9 grid starts pre-filled with a set of pencilmark candidates instead of given digits. Your task is to eliminate incorrect candidates using standard Sudoku rules until exactly one digit remains in each cell. All 81 cells begin with multiple possibilities.
Sukakuは通常のSudokuとどのように異なるのですか？
In classic Sudoku, some cells are pre-filled with confirmed digits. In Sukaku, no cell has a confirmed digit — instead, each cell shows a subset of possible digits as pencilmarks. The starting pencilmarks are curated by the puzzle constructor and are always consistent with the unique solution.
Are the starting pencilmarks always correct?
Yes. The pencilmarks shown at the start of a Sukaku puzzle represent a valid subset of candidates for each cell — they are never wrong, but they may include more candidates than strictly necessary. Your job is to eliminate all but the correct digit using logical deductions.
What techniques work best in Sukaku?
All standard Sudoku elimination techniques apply: naked singles (when only one candidate remains in a cell), hidden singles (when a digit can only go in one cell within a row, column, or box), naked pairs, pointing pairs, and advanced techniques like X-Wings and Swordfish. The absence of given digits means you rely entirely on elimination.
Is Sukaku harder than regular Sudoku?
Easy Sukaku is more forgiving than classic Sudoku because the pencilmarks are already provided — you never have to work out candidates from scratch. Hard and expert Sukaku puzzles with minimal starting candidates require the same advanced techniques as difficult classic Sudoku.
How long does Sukaku take to solve?
Easy puzzles take 5–15 minutes. Medium puzzles run 15–30 minutes. Hard puzzles average 30–60 minutes and expert puzzles can take over 90 minutes. Solve time scales with how many eliminations each technique step provides.