There are five boy soldiers in this classic illustration but one of them appears to have gone missing. If you can’t manage to spot him then you aren’t alone, but you might find flipping the image upside down makes things a little easier.

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Picture riddles offer a great way to boost your mental health and train those observation skills of yours. From helping you relax and unwind to training you to recognize and analyze the smallest of details, puzzles have been all around us for our entertainment for centuries.