Each Kakuro puzzle is composed of a number of rows and columns, some cells are empty and light coloured, others some have numbers in them. At first look therefore it looks like a crossword.Every sequence of cells in either a row or a column is called a 'run'. At the left of each horizontal run, and at the top of each vertical run, you will see a number. In the image above, you can see, for instance, a '5' in the second cell on the top row. This means simply that the sum of the two cells underneath it is 5. Next to the '5' is '21' - this means, therefore, that the three cells underneath it sum to 21. And so on, throughout the puzzle. Using this information alone, you can solve a Kakuro puzzle. The key constraint is that you can only use a number once in each run. Therefore if you need to make '6' from two numbers, you cannot use '3' twice, but must rather use 1 and 5 or 4 and 2. You may only use the numbers 1 to 9.

One can play puzzles for one full week.
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