The rules of sudoku are very simple.
You start with a 9 x 9 square grid, containing some numbers and some empty boxes. The aim is to complete the grid so that there are no empty grid squares.
Every row, column, and 3 x 3 mini-square must contain the numbers 1,2,3,4,5,6,7,8,9 once and once only.
With a true sudoku grid, there is only one solution for each grid, and you can solve it using logic alone.
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