New Delhi, July 23 -- Optical illusions and spot-the-difference games are a great exercise for your mind. These puzzles help to pass the time while sharpening your cognitive skills. One challenge doing the rounds these days invites users to spot the odd word in a sea of 'grass.' The photo is all about testing your visual skills to the limit. Only those with the sharpest eyes will be able to figure out the odd word in less than 10 seconds.

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The photo contains a grid, with the word grass repeating in all cells except one. Your task is to find the odd word out in less than 10 seconds. The key to solving this brain teaser is to divide the grid into smaller p...