Sudoku and Skyscrapers are both grid-based logic puzzles you solve by pure deduction, so solvers naturally wonder how alike they really are. The short answer: Skyscrapers is close to Sudoku. Below we lay out what the two share, where they part ways, and whether the skills you have built on Sudoku will carry over.
- Grid: N×N (commonly 4×4 to 7×7)
- Closeness to Sudoku: Close
- Also called: Wolkenkratzer, Towers, Skyline
What is Skyscrapers?
A Latin-square grid of building heights where each row and column holds 1–N once, and clues around the edges tell you how many buildings are visible from that side — a taller tower hides every shorter one behind it. Here are the rules in full:
- Fill the grid so every row and column contains each height 1–N exactly once — a Latin square, just like Sudoku rows and columns.
- Each number is a building height; the clue outside a row or column says how many buildings are visible looking in from that edge.
- A taller building hides every shorter one behind it, so a clue of 1 means the tallest tower (N) sits nearest that edge, and a clue of N means the heights climb 1, 2, 3 … away from it.
What Skyscrapers looks like
Skyscrapers is played on a small N×N grid — here 4×4. The inner cells are building heights (1–4, each once per row and column, exactly like Sudoku). The grey numbers around the edge are the clues: each says how many buildings you can see looking in from that side, because a taller tower hides every shorter one behind it.
A solved 4×4 Skyscrapers (blue = heights, grey = edge clues). The top row reads 2 · 1 · 4 · 3, and its left clue is 2: from the left you see the 2 and the 4 — the 1 hides behind the 2 and the 3 hides behind the 4.
Strip away the visibility clues and every row and column is just a Latin square — the same no-repeats rule as a Sudoku line, without the 3×3 boxes. That is why the row-and-column scanning you already do in Sudoku is the engine that solves a Skyscrapers grid once the edge clues have pinned down the extremes.
What Skyscrapers shares with Sudoku
- The core is a Latin square — each row and column uses every symbol exactly once, identical to Sudoku's row and column rule.
- Both are single-solution, pure-logic puzzles cracked by candidate elimination, never by guessing.
- An edge clue prunes candidates the way a Sudoku given does: you scan a line, rule out what can't fit, and place what must.
How Skyscrapers differs from Sudoku
- Skyscrapers has no 3×3 boxes — only the row/column Latin-square constraint plus the visibility clues.
- The numbers are heights that block sight, so their order along a line matters; a Sudoku digit only has to be present, not ranked.
- The grid is usually smaller than 9×9 and its size varies, and the clues sit outside the grid rather than inside it.
Do Sudoku skills transfer?
Because every row and column is a Latin square, the row-and-column scanning you use in Sudoku — crosshatching to find where a value is forced — is exactly how you place heights once the edge clues have trimmed the candidates.
Brush up on the technique that carries over: Crosshatching.
The verdict
Skyscrapers is Sudoku with the boxes removed and visibility clues bolted on — a Latin-square cousin that swaps arithmetic for line-of-sight logic.