Rules: To start the game, klick the "shuffle" button. Then try to sort the numbers again, by moving them around. The array should look like the solution that is shown at the right.
To move the numbers, click on a number that lies in the same row or column as the emopty field.
Now all numbers between the empty field and the clicked field (including the clicked one) will
move towards the empty field. This way you can reorder all the numbers.