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The SUDOKUBOARD is divided into 81 squares and sub-divided into 9 grids each containing 9 squares.
What you need to do is fill the empty squares with the numbered tiles so each row, each column and each 3x3 grid contains the number 1-9. No two numbers must repeat themselves in any row or grid. All the squares must be filled.
To start, place a puzzle under the grille.With the double sided coloured tiles continue filling in the squares by:
Using the black side for your definite answers. Using red side for your possible answers, when sure turn over to black. Use the red side of the mini tiles to help if you have several choices in one square. When sure you can remove them and replace with a correctly numbered black tile, or turn over the correct mini tile.