困难 摩天楼数独
网格外部的提示数计算从该侧看时可见建筑物的数量（较高的建筑物遮挡较矮的）。
困难 摩天楼数独。中等范围的线索值允许许多排列——优先放置数字9，然后向下进行。
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什么是摩天楼数独？
难度
★★★★☆
4/5
约束类型
外部线索
典型给定数
4–10 clue values
平均解题 (困难)
50 分钟
困难 级别的解题技巧
| 技巧 | 描述 | 级别 |
|---|---|---|
| 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. | 初级 |
| 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. | 初级 |
| Permutation Enumeration | For each clue value V, enumerate all permutations of 1–9 that give exactly V visible buildings. Cross-reference opposite-edge clues. | 中级 |
| 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. | 中级 |
| Multi-Edge Constraint | Combine the clue from one edge with the opposite edge's clue. Both must be simultaneously satisfiable. | 高级 |
准备好终极测试了吗?试试 专家 摩天楼数独 — 数独 上最难的谜题。
在困难需要掌握的技巧
- Hidden Pairs technique — Permutation pruning removes mid-height candidates unevenly — recount boxes along heavily-clued edges, where hard skyscraper grids tuck their pairs.
- X翼技巧 — 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.
按难度划分的平均解题时间
简单
12 分钟
中等
25 分钟
困难
50 分钟
专家
80 分钟
想要规则、策略和解题步骤的完整指南吗？
如何玩摩天楼数独 →
相关变体
外部数独
Both decode digits written around the border — placement windows here, visibility counts there.
三明治数独
Another grid solved from the margins, swapping visibility logic for sums between the 1 and the 9.
小杀手数独
Outside clues turned diagonal: arrows fire sum totals across the grid instead of counting buildings down a line.
常见问题 — 困难 摩天楼数独
更多问题？请参阅完整 摩天楼数独指南.