Optical illusions can often be quite tricky for the mind.
Some people might see different things in an image, while others could be more straightforward.
Now the latest illusion which could leave you baffled for days involves a hidden message.
READ MORE: Mind-blowing new optical illusion baffles as it appears to change colour
Rainbow Riches Casino has hidden two digits in this illusion and most people are unable to spot the numbers.
According to the gaming website, only 40% of players have been able to spot the hidden digits.
So think you've got what it takes? Why not give this illusion a try and let us know how you get on in the comments.
If you're stuck and looking for a clue, Rainbow Riches Casino is giving you two:
- In Back to The Future, Marty McFly travelled this number of years back in time
- When a married couple reaches this many years of marriage, it is known as their Pearl Wedding Anniversary
The optical illusion was tested on 80 people back in September with a huge amount unable to solve it.
For those who solved the brainteaser will have seen the magic number that's hiding is 30.
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Looking for more optical illusions?
Previously, an optical illusion was hiding an animal in the photo and anyone who finds it is a natural born leader.
The design features the outline of a specific animal hidden among a set of brightly coloured lines.
As the lines are laid so closely together, for many, the pattern can produce a hypnotic effect.
And this means it'll make it difficult to spot the cleverly concealed image.
Also an optical illusion shows a cat and if you find it within 5 seconds, then you have a top IQ.
Studies show that the more you exercise your brain with difficult puzzles, the smarter you'll be.
Some might see the cat crawling either up or down the staircase – so don't worry if you're struggling.
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