New Delhi, Aug. 26 -- Optical illusions are spreading like wildfire on the internet, including social media platforms. These challenges are interesting as they teach you to look beyond mere appearance to solve a problem. By regularly taking part in these challenges, one can improve their observation skills and cognitive agility. If you prefer to put your observation and problem-solving skills to the test, we have one such viral brain teaser for you. From this grid of 727, you must locate 721 within 10 seconds.

At first glance, the observer has a grid of the number 727. It seems like 727 occupies every nook and cranny of the grid in this viral optical illusion. The number 721is somewhere camouflaged in this grid. The challenge is to locat...