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.
Where to play it
If it was Sudoku you came for, the level is the choice that matters more than the variant - Skyscrapers and Sudoku part ways on the rules, but a Sudoku grid can be a two-minute warm-up or an hour of work depending on nothing but how much of it you are given.
Difficulty and type are two separate dials here: the type sets the extra rule, the level sets how much of the grid you start with. Easy Sudoku leaves 36 of the 81 cells filled, so there is always an obvious next move somewhere; Evil Sudoku leaves 23, with no easy moves at all. Take it at the gentler end while the pattern is still new, and move up once it stops being a fight.