Skyscraper Sudoku for Kids

Skyscraper Sudoku is a friendly twist on the classic 9×9 sudoku grid. Each number you write is also the height of a tiny skyscraper — a 1 is a one-storey shop, a 9 is a nine-storey tower. Around the four edges of the grid you’ll see little blue numbers. Those are the visibility clues, and they tell you how many skyscrapers you’d see if you stood at that edge and looked along the row or column toward the other side.

Skyscraper Sudoku is part of the same family as Hyper Sudoku — both are "hyper" sudoku variants that add an extra rule on top of the normal sudoku rules. Hyper Sudoku adds four extra mini-boxes hidden inside the grid; Skyscraper Sudoku adds visibility clues all the way around the outside. Same friendly board, same numbers 1–9, same goal of filling every row, column and 3×3 box without repeats.

Adults sometimes call this puzzle "Towers Sudoku" or just "Skyscrapers". They’re the same game. We’ve made the buildings cute, the clues big and the colours bright so it’s easy to learn for kids who already enjoy regular sudoku.

In regular Hyper Sudoku the extra rule lives INSIDE the grid: four tinted 3×3 mini-boxes in the corners that each have to use the digits 1–9. In Skyscraper Sudoku, the extra rule lives OUTSIDE the grid: visibility clues around the four edges. Both are "hyper-constrained" sudokus — extra rules that give you extra clues — but they look really different on the screen.

You still need to solve the row, column and 3×3 box rules. But the clue numbers are like little arrows pointing into the grid — they tell you where the tall buildings are likely to be. A clue of 1 means the very tallest building (9) is at that edge. A clue of 9 means the buildings climb up like a staircase, smallest first: 1, 2, 3, 4, 5, 6, 7, 8, 9. And in between, the clue tells you how many "rooftops" peek out above the others.

Imagine a tiny row with just five buildings: 3, 1, 5, 2, 4. If you stand on the left and look right, what do you see? The 3 is the first thing in your way, so you see it. The 1 is shorter than 3, so it’s hidden. The 5 is taller than the 3, so a new rooftop pokes out — you see it. The 2 is shorter than the 5, hidden. The 4 is also shorter than the 5, hidden. From the left you see 2 buildings: the 3 and the 5.

From the right side of that same row you see: 4 first, then nothing taller until the 5 (visible), then nothing taller after that. Two buildings from the right too — the 4 and the 5. Cool, right? Each clue counts only the rooftops that "stick out" above everything in front.

On a real 9×9 Skyscraper Sudoku, the same idea applies — just with nine buildings per row instead of five. The clue counts the rooftops you’d see if you walked toward that row from outside.

Most kids who already enjoy classic 9×9 sudoku pick up Skyscraper Sudoku in two or three games. If the buildings idea feels brand new, try a few rounds of Hyper Sudoku first — both puzzles use the same 9×9 grid and the same friendly tools, so you’ll already know your way around.

Once Easy Skyscraper Sudoku feels comfortable, try Medium Skyscraper Sudoku. From there you can graduate to Hard Skyscraper Sudoku, and finally take on Expert Skyscraper Sudoku — our toughest skyscraper puzzle.

Want a totally different brain workout? Try our Hyper Sudoku (sudoku with four extra mini-boxes hidden in the grid), our X-Sudoku (sudoku with two big diagonals), our Thermo Sudoku (sudoku with thermometer shapes), our Killer Sudoku (sudoku with cage sums) or our Jigsaw Sudoku (classic rules, but the boxes are wiggly shapes). Younger players can also try our 4×4 sudoku and 6×6 sudoku starter grids.