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| Can you solve GCHQ's Christmas card puzzle? | Can you solve GCHQ's Christmas card puzzle? |
| (34 minutes later) | |
| Britain's most secretive organisation - GCHQ - has added a cryptic twist to Christmas card season by including a baffling brainteaser. | Britain's most secretive organisation - GCHQ - has added a cryptic twist to Christmas card season by including a baffling brainteaser. |
| This year spy agency director Robert Hannigan is sending out a complex grid-shading puzzle inside his traditional Christmas cards of the nativity scene. | This year spy agency director Robert Hannigan is sending out a complex grid-shading puzzle inside his traditional Christmas cards of the nativity scene. |
| Successful codebreakers will uncover an image in the grid that leads to a series of tougher challenges. | 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. | Those not on the card list can have a go here or on the GCHQ website. |
| Mr Hannigan is asking players who complete all the stages to submit their answer to GCHQ by the end of January. | Mr Hannigan is asking players who complete all the stages to submit their answer to GCHQ by the end of January. |
| Those who enjoyed the challenge are asked to make a donation to the National Society for the Prevention of Cruelty to Children. | Those who enjoyed the challenge are asked to make a donation to the National Society for the Prevention of Cruelty to Children. |
| How to play | How to play |
| Have you received, or are you about to send an unusual Christmas card? Email haveyoursay@bbc.co.uk with your stories. | |
| Please include a contact number if you are willing to speak to a BBC journalist. You can also contact us in the following ways: | |
| Or you can comment here: |
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