Skyscrapers Puzzle
build the city · count the towers you can see

Play Skyscrapers — Free Tower Logic Puzzle

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How to play Skyscrapers

Each square is a tower of height 1 to N. Every row and every column holds each height exactly once.

A number around the edge says how many towers you can see looking in from that side. A taller tower hides every shorter one behind it — so a clue of 1 means the tallest tower is right at the front.

Click a square and type a number (or use the keypad). Notes lets you pencil in possibilities. Click a clue to tick it off once you have used it. A clue turns green when its row or column is full and correct.

How to play Skyscrapers

Fill the grid with towers so every row and column holds each height once — and the edge clues count how many towers you can see.

The rules

  1. An N×N grid (here 4×4 to 7×7) is filled with towers of height 1 to N.
  2. Each row and each column contains every height exactly once.
  3. A clue outside the grid tells you how many towers can be seen looking along that row or column from that side.
  4. A taller tower hides every shorter tower behind it, so you only see a tower if it is taller than all the towers in front of it.

Playing here

  1. Choose a grid size (4×4 to 7×7) and a difficulty, then press New Puzzle.
  2. Click a square and type a height, or use the keypad. Notes pencils in possibilities; Show all possibilities fills them in for you.
  3. Click a clue to tick it off. A clue turns green when its line is full and correct, red if it is full and wrong.
  4. Hint fills one square and explains the reasoning. Send to Solver opens the puzzle in the step-by-step solver; Send to Slate puts it on a Slate whiteboard; Print gives a clean copy on paper.

Tips

The full guide, with a worked example and common mistakes: How to play Skyscrapers.

Questions

Why can't I see a short tower behind a tall one?

Exactly like a real street: a shorter building behind a taller one is hidden. Count a tower only if it is taller than every tower in front of it.

Is there always one answer?

Yes. Every puzzle in the Skyscrapers game is checked to have exactly one solution, and Easy to Hard can be solved by reasoning alone.

Can the solver explain a puzzle from a book?

Yes. Type the clues and any given heights into the Skyscrapers Solver and step through every deduction.

What age is it good for?

4×4 puzzles suit ages 8 and up; 6×6 and 7×7 Expert puzzles challenge adults.

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