Most Brits will be left utterly stumped at this impossibly difficult . If you consider yourself the brains of the family, have laser-sharp eyes and meticulous attention to detail - this puzzle is for you. You'll need to spot all 15 differences in the two images below by racing against the clock, and only those with perfect 20/20 vision will come out victorious.

Brainteasers like this are a great way to get competitive with your friends and family members (not like you need an excuse) and can keep the little ones distracted for a couple of peaceful minutes. However, research has also demonstrated these type of games can positively impact the central nervous system, resulting in better concentration levels and improved attention span. So, let's crack on, shall we?

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Created by sofa specialists over at , the two image above might first seem identical. But, it's time to put your specs on and find all 15 differences in just 30 seconds or less to prove you have 20/20 vision. We're not giving away any clues but here's a tip: zooming into the image may help you pick up these subtle alterations a little quicker.

Giving up already, or reckon you've cracked it in the nick of time? Either way, once your alarm has started to ring you need to stop and scroll down to the bottom of the article to find all of the answers.

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If that spot the difference was merely child's play for you, let's ramp things up a notch. Below is a fiendish riddle that's left swathes of Brits scratching their heads - even though the answer is pretty easy. You've got just seven seconds to solve it and prove to the that you have the IQ of a modern day genius. Once you're done, you can - and no cheating!

"King Nupe of the kingdom Catan dotes on his two daughters so much that he decides the kingdom would be better off with more girls than boys, and he makes the following decree: All child-bearing couples must continue to bear children until they have a daughter!" . "But to avoid overpopulation, he makes an additional decree: All child-bearing couples will stop having children once they have a daughter! His subjects immediately begin following his orders. After many years, what’s the expected ratio of girls to boys in Catan?"

Up for another mental workout? Check out our whole collection of - or, learn more about your hidden personality traits with these .

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