A mindboggling brainteaser has challenged Brits to spot the hidden nail among a sea of screws. The tricky optical illusion came courtesy of a post on by user @No-Wallaby-5187, who posted the puzzle to the social media channel's brainteaser thread page entitled Find The Sniper. Finding the lone nail is undoubtedly a tough task, as it is concealed around a number of screws that are almost identical in colour, shape and size.
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