CIA challenges wannabe spooks to tell what time it is in this photo… can YOU do it?
THE CIA has set wannabe spooks another visual puzzle - this time with a wintry theme.
The spy agency challenged Twitter users to "put your analytical skills to the test" by working out the time of day in a ski resort street scene.
The new puzzle challenges users to search for visual clues to work out if it's 7am, 11am or 3pm - but what you are looking for is up to you.
The image shows icy roads with tracks made by school buses and deserted ski lifts going up a tree lined hillside.
Many who took up the challenge reckoned the long shadows, snow on parked cars and the lit street lights were key to solving the puzzle.
One said: "Easy, look at the light poles turned on which means it's 7am. Am I hired?"
Another agreed: "7am. The lights are on because they are still in the shadows and have not gone off for the day."
A third reasoned: "7am. Transport for skiers are empty, street lights on (probably from the night before), school buses arriving? Snow on parked cars."
But others thought it was afternoon, with one saying: "It's 3.04pm and those buses outside the school are about fill up."
"It's also winter and the sun sets down before 4pm in many areas," offered another user.
In a Twitter poll, one-in-eight people guessed 11am, a third said 3pm and over half reckoned it was 7am.
The CIA later revealed that 7am was the right answer.
It tweeted: "Most of you guessed correctly. Seems like you all have an eye for this. You should check out our careers page. #DiscovertheCIA."
It is the latest of the CIA's #TuesdayTrivia posts after a series of popular spot-the-difference puzzles - which saw eagle-eyed wannabe spies beat the agency at their own game.
The CIA has a aimed at attracting youngsters to think about the agency's work
In September the CIA challenged Twitter to spot ten differences in a city scene - but many beat them by finding 11 or more.
The CIA tweeted: "If you found more than 10 differences, you practiced good tradecraft. Always look for opportunities to learn more."
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The same happened the following month when users claimed they found 16 differences, five more than the target.
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Britain's GCHQ has also used puzzles in its recruitment campaigns, although they are much tougher.
They are so popular the code-cracking agency has published a book of logic challenges.