New Delhi, Sept. 25 -- Optical illusion challenges have become a staple on the internet. They are quick, puzzling, and addictive; the kind of posts that are shared because they test how sharp your eyes really are. From hidden animals to disguised objects, these illusions often go viral because they push people to compete with themselves and others to spot hidden things that everyone else misses.

The latest challenge comes from Reddit's FindTheSniper community, which regularly posts optical illusion challenges. This one, labeled "medium difficulty," asks viewers to find the frog hidden among the leaves.

The photo looks like nothing more than a cluster of large green leaves sitting in a bed of stones. But somewhere in the photo, there is ...