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SUDDO is played on a 9 by 9 grid just like a normal Sudoku grid - but with a difference!
The two columns either side of the central column are left blank. The two rows above and below the central row are also left blank.
At the beginning of each game numbers are placed in the central column and central row as shown in the diagram opposite. When played on a mobile or tablet, these numbers are placed there automatically as soon as the game is loaded. If you are playing on paper, your simply insert six different numbers (in the range 1 to 9) in the central row and six in the central column.
You are now ready to play.
The object of the game is to place the numbers 1 to 9 in each of the coloured squares so that no number appears twice in any row, column or coloured square.
During one turn a player may either place a number in a square or take one out.
You will see later why you might want to use up a turn by taking a number out!
This is what the SUDDO grid looks like when you are about to start your game