A baffling brain teaser that puts your observation skills to the ultimate test has left the internet stumped... so how quickly can you solve it? The spot-the-difference puzzle, which was published by , calls for people to identify ten differences between two images in less than 30 seconds - with its creators claiming that the test can only be solved by the 'most attentive individuals'. The pictures, which depict students sitting in a classroom, may look the same at first glance, but when you take a closer look, you will discover there are many differences between the two.
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