The Japanese 'Sudoku' puzzle seems to be catching on fast, with the fiendishly tricky numbers puzzle even being sighted in The Glen. For anyone that has been spending the last few weeks in a sensory deprivation tank, or perhaps on another planet, the rules are quite straightforward. The game is played on a grid of squares, nine by nine, giving a total on 81 squares. This large grid is further subdivided into nine smaller grids, each three by three. Some of the squares will already have a number in, to help get you started, but from there it is up to you. You have to arrange each horizontal line so that it contains each of the numbers 1 to 9, just once, and similarly the vertical columns must also contain the numbers 1 to 9. Now if this wasn't tricky enough you must also ensure that each of the smaller grids contains all of the numbers 1 to 9, just once. Under no circumstances must any number appear more than once in any horizontal or vertical line. | |

Have a go at the one shown here. You can click on the grid to see a larger version which you could print out or copy. When you're ready to check what you've done click HERE for the solution. |

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