As we only have 25 squares in the row, this pattern can only fit in one way – the first square in the row has to be shaded, and the rest just follow, with only one blank square between each run of shaded squares.Īre there any others like this? Column seven ("7 1 1 1 1 1 7") sums up to 19. These numbers add up to 20 and as there are six blocks, you need at least five blank squares to separate them. Take a look at row 22 on the horizontal axis – the one that has the sequence "1 3 1 3 10 2". In fact, it is already started, and it is easy to fill in a few more squares. Just sit down, put on your thinking cap and try to reason it out. So how do you reach the solution? One way of cracking it is to resort to old-fashioned paper and pen. ![]() The problem is made trickier because each horizontal row intersects a vertical column, each with its own sequence code. For example, the row marked "7 3 1 1 7" should contain a sequence of seven shaded cells, followed by at least one blank cell, then three shaded cells, followed by at least one blank cell – and so on. The numbers represent a sequence of shaded cells, that need to separated from each other by at least one blank cell. By way of a clue, each row and cell has a sequence of numbers attached to it. But which ones? Well, a few of the "black" squares have been completed for you, but most you will have to do yourself. The puzzle requires that you shade in squares on the 25x25 grid shown above. So what do you need to do to be in with a chance? A winner will be drawn from all the correct answers – and doubtless be named to much fanfare. ![]() ![]() If you can solve the puzzle, along with the others that it will lead to, you can email the solution to GCHQ (the Government communications headquarters) before January 31.
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