Britain's most secretive organisation - GCHQ - has added a cryptic twist to Christmas card season by including a baffling brainteaser.
Successful codebreakers will uncover an image in the grid that leads to a series of tougher challenges.
Those not on the card list can have a go here or on the GCHQ Website
In this type of grid-shading puzzle, each square is either black or white. Some of the black squares have already been filled in for you.
Each row or column is labelled with a string of numbers. The numbers indicate the length of all consecutive runs of black squares, and are displayed in the order that the runs appear in that line. For example, a label "2 1 6" indicates sets of two, one and six black squares, each of which will have at least one white square separating them.
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