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# What are the rules of Sudoku?

The rules of sudoku are quite straightforward, and this makes it easy to grasp and start playing.

You are presented with a grid that has some cells already filled with a number, whilst most cells are empty.

The rules of the puzzle are simple: fill the grid with the numbers 1 - 9 in such a way that:

- each row, each column and each 3 x 3 box contains the numbers from 1 - 9 once and once only.

Note that if the dimensions of the puzzle are different, e.g. 6 x 6, then of course it is the numbers 1 - 6 that must be placed once only.

A valid sudoku puzzle has one unique solution that can be reached through using logic alone and no need to guess.

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