Optical illusions can deceive you into seeing things which aren't necessarily there.
Some could take a while to understand, while people can spot others fairly quick.
Now the latest illusion to really baffle the internet was created by Jackpotjoy and we think it's a head-scratcher.
READ MORE: Colourful optical illusion has hidden number – but half of people can't find it
In the photo it has a hidden number made up of two digits which can be difficult to spot at first.
So do you think you can find it easily? Let us know how you get on in the comments section below…
According to Jackpotjoy, about nine in 10 people can see the hidden number if they look for long enough.
Head of brand at Jackpotjoy Alex Fagelson said: "We are celebrating a big birthday and it's the number hidden in these images.
"Another hint to crack these tricky illusions is to zoom out or make the images smaller.
"Suddenly the secret number will be revealed! Good luck to everyone who cracks these tricky puzzles."
Other examples of this hidden number illusion were shared recently by the bingo experts.
Previously, eagle-eyed players were baffled by which number was there, while only 10% can solve another one.
In other optical illusions, a tricky one baffled the internet as it showed a woman waiting at airport.
The image has the female waiting at a German airport while wearing black jeans and some Vans trainers.
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