Skyscraper Sudoku — Play Free Online
Skyscraper Sudokuis a handsome twist on the logic-puzzle idea. Every number on the grid is a building's height: each row and column uses each height once (the Sudoku rule you know), but the clues printed around the edges tell you something new — how many buildings you can see from that direction. A taller building hides every shorter one behind it, so those edge numbers are the key to the whole puzzle.
How Skyscraper Sudoku works
Start with the extreme clues. A clue of 1 on one side means the tallest building in that row or column sits right at that edge. A clue equal to the grid size (say 5 on a 5×5) means the heights must climb 1, 2, 3, 4, 5 in order. Lock those forced cells in as a skeleton, then tighten the rest with the row-and-column no-repeat rule.
How Skyscraper clues work
Each edge clue counts the buildings you can see from that side — a taller building hides every shorter one behind it. The lit towers are the ones visible from the left. Shuffle the heights and watch the clues change.
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5 · Seen from left1 · Seen from right
Start at 4×4, scale up
A small 4×4 or 5×5 has just a few buildings — minutes to grasp how visibility works. Larger grids weave the edge clues together more tightly and lean harder on spatial reasoning. Difficulty is adjustable, so beginners and veterans both get a sensible start.
Free, no download, on any device
Skyscraper Sudoku plays right in your browser on phone, tablet or desktop. There's nothing to install and no sign-up — the core game is completely free.
Play Skyscraper Sudoku free now →
Frequently asked questions
What is Skyscraper Sudoku?
Skyscraper is a grid logic puzzle where each number is a building height. Every row and column uses each height exactly once, and the clues around the edges tell you how many buildings are visible from that direction — a taller building hides the shorter ones behind it.
What do the numbers around the edge mean?
They count how many buildings you can see from that side. A clue of 1 means the tallest building is closest; a clue equal to the grid size means the heights climb 1, 2, 3… in order.
Is Skyscraper like normal Sudoku?
It shares the "each number once per row and column" rule, but trades the boxes for the visibility twist, so the solving logic feels different and fresh.
Is Skyscraper Sudoku free?
Yes — completely free in your browser, with no download and no account needed.
Can I race Skyscraper with friends?
Yes. Skyscraper is one of the modes you can play head-to-head in multiplayer — create a room, share the link, and solve the same puzzle at the same time.