Example puzzle
This is an example puzzle. You can solve it the same way as you would solve competition puzzle, but result never stored. You can reveal an answer for the puzzle by clicking "Show answer" link.
Skyscrapers
Author: Andrey Bogdanov
Insert a digit from 1 to 5 into every cell, so that each digit appears once in each row and column . Each digit in a cell represents the height of a building. Numbers outside the grid indicate how many buildings a distant observer could see (at least part of) in that row or column. A building will hide any shorter buildings behind it.
Grid control: Click at a cell reveals the value chooser. Click at the selected value changes the state of the cell. More details about grid control are at the help page.