Optical illusions are never meant to be easy to solve.
But some brainteasers can work wonders for your intelligence, IQ score and even patience.
The latest puzzle to go viral is asking players to spot the odd word within a 15 second time limit.
READ MORE: Optical illusion challenges people to find all 13 hidden animals in 19 seconds
Do you think you can solve it in quick time?
In the illusion, people are challenged to find the word "Retro" hidden in the sea of words spelt as "Petro".
The beauty of this is that you could have the eyes of a hawk if you manage it in time!
Brainteasers like this one can boost your cognitive abilities and concentration.
In fact, daily practice of puzzles can significantly influence your brain health and even boost your self-esteem.
While it can be hard to find the odd word in 15 seconds, it's not too difficult if you really focus on the image.
Scroll down for the answer…
For starters, try scanning each row slowly.
Different viewers may perceive images differently but it can demonstrate a level of cognitive ability if you manage it.
If you're still struggling to locate the word, try looking at the second column and around the the top part.
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Are you looking for more brainteasers?
Recently we revealed an illusion with hidden animals in a photo, but only certain people can spot them.
Also dirty-minded people were left giggling at an optical illusion involving a couple.
Posting on the Confusing Perspective account, it shows a smitten couple holding hands at the park.
It looks like everyone's tuning into a show as there's people sitting on blankets and chairs gazing in one direction.
While the couple took the photo to show how cute they are, the woman in front of them is stealing the show.
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