困難摩天大樓數獨
網格外側的提示數字表示從該側看過去可見的建築物數量（較高建築物會遮擋較矮的）。
困難 Skyscraper數獨。中等範圍的線索值允許許多排列——優先放置數字9，然後向下進行。
3
3
3
3
4
2
2
4
1
5
2
2
3
1
4
4
2
4
6
7
8
8
5
6
7
2
5
1
5
2
3
7
3
1
1
5
6
9
3
3
9
5
4
8
4
1
2
4
2
4
3
2
3
3
3
4
2
4
1
5
2
3
5
什麼是 Skyscraper數獨？
難度
★★★★☆
4/5
約束類型
外部線索
典型給定數
4–10 clue values
平均解題時間（困難）
50分鐘
解題技巧：困難 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 |
準備好終極測試了嗎？試試 專家 Skyscraper數獨 — 數獨 上最難的謎題。
在 困難 需要掌握的技巧
- Hidden Pairs technique — Permutation pruning removes mid-height candidates unevenly — recount boxes along heavily-clued edges, where hard skyscraper grids tuck their pairs.
- X-Wing 技巧 — Visibility counts pin 9 and 8 to two cells in many rows, which is X-Wing fuel — hard skyscraper puzzles expect you to fish the two tallest digits.
依難度平均解題時間
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演練嗎？
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 — 困難 摩天大樓數獨
還有問題？請參閱完整 Skyscraper數獨指南.