專家 摩天大樓數獨
網格外部的線索計算從該側看時有多少建築物可見（較高的建築物遮擋較矮的）。
專家 Skyscraper數獨。跨行和列的可見性強迫鏈——該格式中最苛刻的變體。無需猜測。
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6
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7
9
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7
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8
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6
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什麼是 Skyscraper數獨？
難度
★★★★☆
4/5
約束類型
外部線索
典型給定數字
4–10 clue values
平均解題（專家）
80 分鐘
解謎技巧（專家 等級）
| 技巧 | 描述 | 等級 |
|---|---|---|
| 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. | 初學者 |
| 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. | 初學者 |
| Permutation Enumeration | For each clue value V, enumerate all permutations of 1–9 that give exactly V visible buildings. Cross-reference opposite-edge clues. | 中級 |
| 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. | 中級 |
| Multi-Edge Constraint | Combine the clue from one edge with the opposite edge's clue. Both must be simultaneously satisfiable. | 進階 |
在 專家 需要掌握的技巧
- X翼技巧 — Expert skyscraper grids leave the tall digits ambiguous between exactly two cells per line — the X-Wing on 9 is less a trick here than the intended mechanism.
- Swordfish technique — Opposing clue pairs synchronise 8's possible columns across three rows at a time; the expert endgame usually closes with a Swordfish on 8 or 7.
按難度劃分的平均解題時間
簡單
12 分鐘
中等
25 分鐘
困難
50 分鐘
專家
80 分鐘
想要規則、策略和解題步驟的完整解說？
如何遊玩 Skyscraper數獨 →
相關變體
外部數獨
Both decode digits written around the border — placement windows here, visibility counts there.
Sandwich數獨
Another grid solved from the margins, swapping visibility logic for sums between the 1 and the 9.
小殺手數獨
Outside clues turned diagonal: arrows fire sum totals across the grid instead of counting buildings down a line.
常見問題 — 專家 摩天大樓數獨
更多問題？請參閱完整 Skyscraper數獨指南.