India, Aug. 25 -- A new optical illusion has been gathering all the attention online. The challenge is simple: find the hidden number '9909' between a grid of '9009'. It might seem easy at first, but you only have 10 seconds to find out the answer. Optical illusions often leave us restless until we figure out what the answer is. These challenges help enhance our focus and concentration.

An image showing a grid with rows and columns filled with the number 9009; however, there is a number 9909 surrounded by numbers 9009 waiting to be spotted. The game is simple, you have 10 seconds to move your eyes left, right, and centre and spot the odd in the evens.

To solve this optical illusion easily, keep these points in mind:

Do not just skim an...