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.

No Touch Sums

Author: Andrey Bogdanov

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Write digits from 1 to 4 (each digits can be used any amount of times) into some cells so that cells with digits don't touch each other even in a point. Clues outside show the sum of the digits in the corresponding row or column.

Example puzzle

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.