India, Sept. 27 -- Optical illusion challenges have become one of the internet's most favorite pastimes. They are quick, addictive, and often frustrating in just the right way. The idea is simple. Players are given an image with a hidden object or animal. The task is to spot it as fast as you can. Since the optical illusion challenges are easy to share and compare with friends, they spread quickly across social media.

The latest viral optical illusion challenge comes from Reddit's FindTheSniper community, known for posting everyday scenes with hidden details that make you squint. This week's post asked users to find the hidden frog in a yard scattered with grass and dry leaves.

It may look like an ordinary yard at first. But somewhere i...