What skilful style to celebrate the vacation than a devilishly hard mystifier . Well , that ’s what one of the UK ’s intelligence agencies , GCHQ , reckons — which is why the Christmas card it ’s been sending out features this incense teaser . Can you solve it ?
This gridiron - blending teaser is , however , just the start . “ By solving this first puzzle actor will make an image that leads to a series of increasingly complex challenges , ” the agency explains .
Well , better get started then . The full grid you want to shade is below , or you may get at a high - res versionhere . GCHQ explains what you involve to do :
“ In this case of grid - shading puzzle , each public square is either bleak or white . Some of the bleak square have already been filled in for you . Each course or column is labelled with a chain of numbers . The numbers indicate the duration of all consecutive run of smutty public square , and are display in the parliamentary procedure that the run look in that line . For object lesson , a recording label “ 2 1 6 ” suggest set of two , one and six sinister squares , each of which will have at least one white square separating them . ”
Solutions to the full solidifying of challenges can be submitted to GCHQ up until the last of January 2016 . The e-mail address you ’ll need to send your answers seems to be revealed during the grade of the teaser - solving . estimable circumstances !
[ GCHQ ]
GCHQ
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