New Delhi, July 11 -- Optional illusions and brain teasers have taken over the internet right now, and this latest Eye Test is no exception. People are sharing it on their WhatsApp group chats and Instagram Stories to give a little challenge to their family members and friends to check how sharp their eyes are. One of the challenges going viral right now invites you to find the hidden 'O' in a group of 'Qs'. Are you up to the task?

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The fun challenge is that you have an image of a nearly filled grid full of similar-looking Qs that are evenly spaced out. But, there is one hidden 'O' hiding among these Qs somewhere in the mix. Sounds...