Skyscraper Sudoku
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Sådan spiller du Skyscraper Sudoku
Standard Sudoku-regler gælder. Hvert blåt ledetrådstal fortæller dig, hvor mange cifre der er synlige, når man kigger ind i gitteret fra den kant — et ciffer er kun synligt, hvis det er større end alle cifre før det fra den retning.
Fuld guide →
Udenfor ledetråde viser, hvor mange 'bygninger' der er synlige fra den kant.
Skyscraper Sudoku Let
Skyscraper Sudoku Mellem
Skyscraper Sudoku Svær
Skyscraper Sudoku Ekspert
Hvad er Skyscraper Sudoku?
Skyscraper Sudoku forestiller sig hvert ciffer som en bygning af den højde. Ledetråde uden for gitteret angiver, hvor mange bygninger du kan se, når du kigger fra den kant indad — en højere bygning blokerer alle lavere bygninger bag den. En ledetråd på 1 betyder, at den første bygning skal være en 9. En ledetråd på 9 betyder, at bygningerne er arrangeret i strengt stigende rækkefølge (1,2,3,4,5,6,7,8,9). Denne variant kræver både Sudoku-logik og permutationsræsonnement.
På et Blik
| Begrænsningstype | Udenfor ledetråde |
| Typiske givne tal | 4–10 clue values |
| Sværhedsgradsvurdering | ★★★★☆ 4/5 |
| Gns. løsningstid — Let | 12 min |
| Gns. løsningstid — Mellem | 25 min |
| Gns. løsningstid — Svær | 50 min |
| Gns. løsningstid — Ekspert | 80 min |
Sådan løser du Skyscraper Sudoku
| Teknik | Hvad det gør | Niveau |
|---|---|---|
| Clue 1 Forces 9 First | A visibility clue of 1 means the first building from that edge must be a 9. All shorter buildings behind it are hidden. | Avanceret |
| Clue 9 Forces Ascending Order | A clue of 9 means all buildings are visible, so digits are in strictly ascending order from that edge: 1, 2, 3, 4, 5, 6, 7, 8, 9. | Avanceret |
| Permutation Enumeration | For each clue value V, enumerate all permutations of 1–9 that give exactly V visible buildings. Cross-reference opposite-edge clues. | Avanceret |
| 9 Always Visible | The digit 9 is always visible from either edge. The digit 8 is visible only if it appears before any 9 from that edge. | Avanceret |
| Multi-Edge Constraint | Combine the clue from one edge with the opposite edge's clue. Both must be simultaneously satisfiable. | Avanceret |
Gennemsnitlige Løsningstider
Let
12 min
Mellem
25 min
Svær
50 min
Ekspert
80 min
Ofte stillede spørgsmål
Hvad er Skyscraper Sudoku?
Skyscraper Sudoku is a variant where numbers appear outside the grid on all four sides. Each number tells you how many distinct 'buildings' (digits) are visible when looking into that row or column from that side. Taller buildings hide shorter ones behind them — a larger digit blocks any smaller digit placed further into the row.
How does visibility work in Skyscraper Sudoku?
Imagine the digits in a row as buildings of different heights. Looking from one end, you can see a building only if no taller building stands between you and it. A clue of 1 means only the first building is visible, so it must be the tallest (digit 9). A clue of 9 means all buildings are visible, so the row must be in ascending order from that side.
What do extreme clue values tell me?
A clue of 1 means the first cell from that side holds a 9 — it blocks everything else. A clue of 9 means the row or column is in strictly ascending order from that direction (1,2,3,4,5,6,7,8,9). Both are immediately actionable. Mid-range clues require enumerating valid permutations.
Is Skyscraper Sudoku harder than regular Sudoku?
Yes, generally. Skyscraper clues require enumerating valid digit permutations for each row and column, which is more combinatorially intensive than classic Sudoku elimination. Easy puzzles are accessible; hard and expert puzzles require tracking visibility across multiple rows and columns simultaneously.
What is the best first strategy for Skyscraper Sudoku?
Start with clues of 1 and 9 — they immediately fix a digit or fully determine the order of a row. Then look for clues of 2, which constrain the position of the 9 significantly. Combine skyscraper deductions with standard Sudoku box and row/column scans.
How long does Skyscraper Sudoku take to solve?
Easy puzzles take 8–20 minutes. Medium puzzles run 20–40 minutes. Hard puzzles average 40–75 minutes and expert puzzles often exceed 90 minutes. Fast solvers develop the ability to enumerate valid visibility permutations quickly without writing them all out.