India, Sept. 29 -- The internet's tricky puzzle hub, r/FindTheSniper, has a new optical illusion challenge that is going viral. Shared by Reddit user u/cooterpoopshooter, the image at first looks like nothing more than a rocky patch of ground with shallow water, moss, and scattered leaves. On the surface, it seems like a peaceful nature shot, but hidden in plain sight is a tiny frog so well-camouflaged that many people in the comments tried getting the answer right.

This challenge works because the frog's skin is almost the same color as the green moss and ground around it. Our eyes are drawn to the brighter objects in the picture, the leaves and stones, so it is even harder to see the little amphibian.

Only those with sharp observation...