Only people with 20/20 vision can spot the hidden letter
The similar shape of the letters makes it devilishly difficult to pick them out, and the challenge is to try and spot them within 11 seconds.
Brainteasers are a test of your problem-solving skills and creative thinking, tasking you to use reasoning, logic, and a bit of lateral thinking to find the hidden answer.
But whether you're taking on a math problem, a visual puzzle or a riddle, they're thought to be great for your brain health and problem-solving skills.
One headscratcher shared by education new site Jagran Rosh challenges you to locate the four Ws hidden in a sea of letters Ms.
The similar shape of the letters makes it devilishly difficult to pick them out, and the challenge is to try and spot them within 11 seconds.
Think you're eagle-eyed? Scroll down to the image below to find out!
READ MORE: You have a 20/20 vision if you can spot the snake under 25 seconds
So... how did you get on?
If this one proved too tough, don't worry - we've all manner of puzzles and brain games to challenge your grey matter and improve your speeds.
The letters are spaced across the board, tucked away in each corner.
You can find the location of each of the letters below.
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One tip with puzzles of this kind is to zoom in on the image, scanning for anything that sticks out among the rows of identical letters or symbols.
It can also be helpful to shift your perspective as often the answer can be right under your nose.
Tilting your head at different angles can allow your brain to look at the image afresh and be more receptive to visual discrepancies.
If you're ready for another challenge, why not see if you can spot the hidden beast in another engaging test of your brainpower?
