India, Sept. 3 -- Optical illusions are all over the internet. Given the multiple benefits of solving these challenges, thousands of people are showing interest in them. If you want to put your observation skills and IQ to the test, we have a perfect challenge for you. Can you spot the mistake in this grid of 11s?

Optical illusions are great at testing a player's vision and ability to concentrate on a subject matter. They also teach people to push the boundaries, leading to increased productivity. At first glance, in this viral brain teaser, you have a grid of the number 11. While it seems 11 is in every nook and cranny of the grid, "1l" is cleverly hidden somewhere in the photo.

11 and 1l appear strikingly identical. However, if you pa...