ジャーマンウィスパーズ の遊び方
緑の線上の隣接する数字は、少なくとも5異なっていなければなりません。
ルール
標準の数独ルールが適用されます： すべての行、列、3×3ボックスに数字1～9を、それぞれが1回ずつ現れるように埋めます。
ジャーマンホイスパー（ホイスパースドクとも呼ばれる）は、グリッド上に緑の線を描きます。線上で隣接する任意の2つの数字は、少なくとも5異なっていなければなりません。最小の差が5で数字が1～9の範囲であるため、これは強い高低交互パターンを作り出します：あるセルが低い（1～4）場合、次は高い（6～9）でなければならず、その逆も同様です。ライン制約により、ほとんどの位置で5が有効な数字として除外されます。
このパズルの出典、関連バリアントとの比較、戦略の概要については、私たちの ジャーマンウィスパーズバリアント概要.
概要
ジャーマンウィスパーズ の解き方
よくある質問
German Whispers Sudokuとは何ですか？ ▾
German Whispers Sudoku is a variant where green lines are drawn across the grid. Any two cells adjacent along a green line must contain digits that differ by at least 5. Standard Sudoku rules apply — every row, column, and 3×3 box must contain 1–9 exactly once.
Why is it called German Whispers? ▾
The name comes from the puzzle community and refers to a variant popularised in German puzzle circles, with 'whispers' evoking the idea of information passing along a line with a significant minimum separation at each step.
What digits can sit next to each other on a whisper line? ▾
Only pairs with a difference of 5 or more: 1&6, 1&7, 1&8, 1&9, 2&7, 2&8, 2&9, 3&8, 3&9, 4&9. This means whisper cells must alternate between the low group (1–4) and high group (6–9). Digit 5 cannot appear on any whisper line.
What is the best first move in German Whispers Sudoku? ▾
Identify the longest whisper lines and mark each cell as low (1–4) or high (6–9) based on alternation. Any whisper cell in a row, column, or box where the low or high group is almost fully placed gives you a direct elimination or placement.
Is German Whispers Sudoku hard to learn? ▾
The constraint is simple to understand but its consequences take practice to apply automatically. The forced high-low alternation is the key insight — once you internalise it, you can immediately split each line cell into one of two groups and halve your candidate list from the start.
How long does German Whispers Sudoku take to solve? ▾
Easy puzzles take 8–18 minutes. Medium puzzles run 18–35 minutes. Hard and expert puzzles can take 45 minutes to well over an hour. Longer whisper lines spanning the full grid are the most time-consuming because they interact with almost every row, column, and box simultaneously.