Skyscrapers Puzzle

Skyscrapers is a logical puzzle that I learned from, a site of online games & puzzles.

Imagine a well designed city where all streets are either parallel or perpendicular. The city buildings are arranged in a N×N square of peculiar property: the numbers of floors in the buildings form a Latin square. These are not shown. It is your task to retrieve those numbers.

You are given clues: the numbers on the sides of the N×N square show how many buildings are seen from that point in the corresponding (either horizontal or vertical) direction. To produce a number click repeatedly in a square where a building is expected.

The applet below has several controls:

  • Undo last: reverses the result of the last click.
  • Restart: returns to the beginning of the current puzzle.
  • New: starts a new puzzle.
  • Store: stores the current configuration of the puzzle.
  • Restore: restores the last stored configuration of the puzzle.

Also you may choose to display the numbers, the "skyscrapers", or both.

This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at, download and install Java VM and enjoy the applet.

Skyscrapers puzzle

What if applet does not run?

Latin Squares

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