Hint 1 – how to sudoku!

If you’re new to sudoku puzzles, here is how they work.
The puzzle consists of a grid divided into different groups of nine squares. There are: nine rows, nine columns and nine 3x3 sub grids. When completed, the numbers 1 to 9 will appear just once in each row, column and sub grid.
Each sudoku puzzle comes with some of the numbers already filled in and you have to work out which numbers go in the remaining blank squares. There will only be one possible solution!

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