India, Sept. 4 -- Do you love playing hide-and-seek? In this viral optical illusion challenge, players have to spot a "puppy" hiding somewhere. Optical illusions are among the top trends on the internet. They help enhance a person's observational skills and improve focus. Playing such games on a regular basis is said to be a healthy exercise for our visual system, focus and concentration.

On Reddit, an optical illusion has left many scratching their heads ever since it was posted on the r/FindTheSniper forum. At first glimpse, players get to witness a room, featuring several books on a shelf, a doormat, and other things. But hidden somewhere in this image is a dog. People have been asked to spot the animal.

Need a hint? The puppy is pre...