New Delhi, July 21 -- While optical illusions are fun and challenging, they are also a great way to exercise your brain and give it mental stimulation. These challenges are often designed in such a way that they confuse the brain. Here is one such optical illusion: can you spot the inverted number 58 in a grid of the number 85? If you can, then you certainly have a high IQ.

Here's the challenge: There is a grid full of similar-looking inverted 85s. However, there is a sneaky inverted 58 hidden somewhere in the tightly placed inverted 85s against a maroon-hued background. And you have exactly 5 seconds to find it.

Also read: This 'find the numbers' optical illusion has the internet squinting - can you spot all three?

This illusion can t...