Diagonal-Sudoku

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Punktzahl
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Neues Spiel
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Einfach · Diagonal-Sudoku Schwierigkeit oben wechseln ↑
Spielanleitung für Diagonal Sudoku
Standard-Sudoku-Regeln gelten: Platziere 1–9 in jeder Zeile, Spalte und 3×3-Box. Die Zusatzregel: Beide hervorgehobenen Diagonalen (↘ und ↙) müssen ebenfalls jede Ziffer genau einmal enthalten. Die mittlere Zelle liegt auf beiden Diagonalen, was sie zur am stärksten eingeschränkten Zelle auf dem Spielfeld macht.
Vollständiger Leitfaden →

Beide Hauptdiagonalen müssen ebenfalls 1–9 enthalten

Was ist Diagonal-Sudoku?

Im Diagonal-Sudoku gelten die Standard-9×9-Regeln – aber mit einer zusätzlichen starken Einschränkung: Beide Hauptdiagonalen (oben-links nach unten-rechts und oben-rechts nach unten-links) müssen jeweils jede Ziffer von 1 bis 9 genau einmal enthalten. Diese zusätzliche Einschränkung macht das Rätsel normalerweise einfacher zu lösen, da die Diagonalen als zwei zusätzliche Einheiten für die Eliminierung wirken.

Auf einen Blick

Constraint-TypZusätzliche Regionen
Typische Vorgaben22–28
Schwierigkeitsbewertung ★★☆☆☆ 2/5
Durchschn. Lösungszeit — Einfach4 Min.
Durchschn. Lösungszeit — Mittel10 Min.
Durchschn. Lösungszeit — Schwer20 Min.
Durchschn. Lösungszeit — Experte40 Min.

Lösungsanleitung für Diagonal-Sudoku

TechnikWas es tutLevel
Diagonal as a Unit Treat each diagonal exactly like a row or column — every digit 1–9 appears exactly once. Standard scanning and counting apply. Fortgeschritten
Diagonal–Box Interaction When a digit on a diagonal is confined to one box segment, eliminate it from the rest of that box. Fortgeschritten
Diagonal Naked Pairs If two cells on a diagonal share the same two candidates, eliminate those values from all other diagonal cells. Fortgeschritten
Three-Unit Intersection A cell on the main diagonal also belongs to a row, column, and box — four constraint units simultaneously — maximising elimination power. Fortgeschritten

Durchschnittliche Lösungszeiten

Einfach
4 Min.
Mittel
10 Min.
Schwer
20 Min.
Experte
40 Min.

Häufig gestellte Fragen

Was ist Diagonal Sudoku?
Diagonal Sudoku adds two extra constraints on top of standard Sudoku: both main diagonals of the 9×9 grid must each contain the digits 1–9 exactly once. This means every cell on either diagonal belongs to four uniqueness groups simultaneously: its row, column, box, and diagonal.
Which cells are on the diagonals?
The main diagonals run from the top-left corner to the bottom-right corner, and from the top-right corner to the bottom-left corner. Together they cover 17 cells (the centre cell is on both). Any cell at position (r, c) is on a diagonal if r equals c or if r + c equals 10 (using 1-based numbering).
How does the diagonal constraint help solving?
Diagonal cells carry four constraints instead of the usual three, making them the most restricted cells on the board. Whenever you place a digit anywhere on a diagonal, it eliminates that digit from the entire row, column, box, and the diagonal simultaneously — often triggering a cascade of placements.
Is Diagonal Sudoku harder than regular Sudoku?
At easy difficulty, Diagonal Sudoku is actually easier than equivalent classic Sudoku because the extra constraints eliminate more candidates immediately. At hard and expert levels, the diagonal interactions create subtler deductions that experienced players find more challenging to spot.
Can I solve Diagonal Sudoku using standard techniques?
Yes — all standard Sudoku techniques (naked pairs, hidden singles, pointing pairs, X-Wings, etc.) apply. You simply treat each diagonal as an additional house. The most important habit is scanning both diagonals after every placement, the same way you scan rows, columns, and boxes.
How long does Diagonal Sudoku take to solve?
Easy puzzles take 5–12 minutes — often faster than equivalent classic puzzles because of the extra constraints. Medium puzzles run 12–25 minutes. Hard and expert puzzles can take 30–70 minutes depending on how heavily the diagonal interactions need to be exploited.
Auch ausprobieren
Irregular Diagonal Sudoku
Keeps both diagonal houses you've learned to scan and adds jigsaw regions for an even denser constraint web.
Hyper Sudoku
The same extra-region idea — four shaded windows instead of two diagonals — so your habit of scanning bonus houses transfers directly.
Jigsaw Sudoku
If you enjoy adapting your scan to new house shapes, jigsaw regions stretch that skill further than straight diagonal lines.
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