Optical illusions are a great way to test your observation skills.
Often images could leave people scratching their heads for ages.
But the majority of brainteasers are simply amazing to quiz you on your IQ level.
READ MORE: Only players with high intelligence can spot 16 tigers within 21 seconds in snap
Now if you think you're good at spotting little detail, see if you can find the circles in this mind-boggling image.
A Reddit user shared the tricky snap which shows black and white lines with four rows of squares.
Apparently there's 16 circles in the image, so can you find them in rapid time?
The user captioned the post: "There's 16 circles in this image."
It didn't take long for people to attempt the test as one admitted: "I almost gave up and then finally saw them."
Another admitted: "I have to blur my eyes to see circles."
While a third commented: "Wow, pretty cool. I never get these, but today I did!"
And a fourth joked: "What kind of of black magic is this? OMG."
Scroll down to reveal the answer…
Now if you're in need of help, one user said: "Spoiler: Look in-between the squares that's where the circles are.
"It took me a while then they somehow appeared."
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Another suggested: "This might help people, I just adjusted brightness of the surrounding areas, no other changes."
And a third cheekily remarked: "What's the illusion? I just see 16 circles."
How long did it take you to find the circles? Let us know in the comments below…
Previously an optical illusion baffled as people were mistaking it for an image of Earth from space.
In the photo, the beam of light through the middle of the picture appears to show the sun arching across the globe.
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