Every year, the director of Britain’s Government Communications Headquarters, which you may have heard referred to in numerous films like James Bond and TV shows like SpooksÂ as GCHQ, sends out a Christmas greeting.

This year, however, the director,Â Robert Hannigan, decided to test the grey matter of his card recipients with a brain bending puzzle.

Printed on the card is aÂ grid-shading puzzle and instructions on how it should be completed. By solving this first puzzle players will create an image that leads to a series of increasingly complex challenges.

Anyone who can get through the puzzle doesn’t instantly become a spy, but they are invited to post their answer in to GCHQ. It is also suggested that, if they enjoy the puzzle, they can make a donation toÂ the National Society for the Prevention of Cruelty to Children, if they have enjoyed the puzzle.

### Getting started

The instructions are sparse, but here goes:

“In this type of grid-shading puzzle, each square is either black or white. Some of the black squaresÂ have already been filled in for you.

Each row or columnÂ is labelledÂ with a string of numbers. The numbersÂ indicate the length of all consecutiveÂ runsÂ of black squares, and areÂ displayed in theÂ orderÂ that the runs appearÂ in thatÂ line.Â For example,Â a labelÂ “2 1 6″ indicatesÂ sets of two,Â one andÂ six blackÂ squares, each ofÂ which willÂ have at leastÂ one white square separating them.

CompleteÂ theÂ grid carefully with aÂ black pen and check your answer is complete and correct before proceeding.”

ClickÂ here for an image you can print.Â

The Guardian describes this puzzle as “infuriating”, while the Canberra TimesÂ says it is the “best puzzle ever”.

### Can you work it out? Are you good enough to be a spy?

1. It’s infuriating alright, can’t see the puzzle. Good thing, too busy for spy work.

• hi Fred, I’ve just fixed that image â€“ you can see it now!

• You really didn’t have to, not for me any way. ðŸ˜´ Not easy to solve on my android phone.

2. I like it , you don’t have to spell.

3. I think the answer is either 17, or “Green”!

4. I’m not!

5. These puzzles and many others like them are in Nancy Drew mystery pc games..which sadly are few and far between to locate anymore…used to spend hours figuring out these types of puzzles..good brain exercise I say!! ðŸ™‚

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