Spielanleitung für Outside-Sudoku
Ziffern außerhalb des Gitters müssen in den ersten drei Zellen dieser Zeile oder Spalte erscheinen
Die Regeln
Standard-Sudoku-Regeln gelten: Füllen Sie jede Zeile, Spalte und jeden 3×3-Block mit den Ziffern 1–9, jede kommt genau einmal vor.
Outside Sudoku platziert Ziffern in den Rändern des Gitters. Jede Außenziffer muss in einer der ersten drei Zellen (dem nächsten Block) der Zeile oder Spalte erscheinen, auf die sie zeigt. Es werden keine Standard-Vorgabenziffern innerhalb des Gitters bereitgestellt – alle Hinweise kommen von den Rändern. Dies erzeugt eine ungewöhnliche Form von Sudoku, bei der die anfänglichen Einschränkungen vollständig von außerhalb des Gitters kommen.
Um zu erfahren, woher dieses Rätsel stammt, wie es im Vergleich zu verwandten Varianten abschneidet und eine Strategiezusammenfassung, siehe unseren Outside-Sudoku Variantenübersicht.
Auf einen Blick
Lösungsanleitung für Outside-Sudoku
Häufige Fragen
Was ist Outside Sudoku? ▾
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.