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Sudoku

example sudoku puzzle What constitutes a valid sudoku puzzle?

A 'pure' sudoku puzzle should:

Have a unique solution
Be symmetrical
Be solvable using logic alone
Be a 9 x 9 grid
Have the numbers 1 to 9, once per row, column, and 3 x 3 square

Any other puzzle is either not a sudoku puzzle or a valid sudoku puzzle.

For instance, many grids have more than one possible solution. The total number of valid sudoku grids may appear at first to be quite small, but in fact there are an incredibly high number of possible solutions - we challenge you to do the math and work out just how many valid sudoku grids there are!

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