Is my Sudoku right?

Is my Sudoku right? Verify the correctness of the Sudoku The first check is to verify that no digit occur more than once in each row, column and 3×3 square. If it turns out that some digits are wrongly placed they are marked with red colour and the row, column or 3×3 square where the error was found is marked with red background.

Verify the correctness of the Sudoku

The first check is to verify that no digit occur more than once in each row, column and 3×3 square. If it turns out that some digits are wrongly placed they are marked with red colour and the row, column or 3×3 square where the error was found is marked with red background.