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The rules in brief

To complete a Sudoku grid you have to fill all empty cells with figures 1 to 9 in accordance with the 3 following rules :

A single line of 9 cells must not contain 2 times the same figure

A single column of 9 cells must not contain 2 times the same figure

A single square of 9 cells (3x3) must not contain 2 times the same figure

Some details

The complete grid of 9 lines by 9 columns is made of 9 small squares of 3 lines per 3 columns, it is only these small squares that must respect the rule of single figure.

Only the rows, columns and boxes must respect the rule of single figure. This rule does not apply to diagonal. There can therefore be several times the same number in the same diagonal.

Sudoku grids are designed in such a way that there is only one final solution (all grids published on this site are checked and scrupulously respect this rule)