Optical Illusion: Only those with the sharpest vision can detect the numbers hidden within these optical illusions.

In each of the four images, a set of numerals is disguised by colourful lines and patterns, which become easier as you scroll down.

Each of the designs conceals the same hidden number

The platform polled 100 people to determine the difficulty of each challenge.

The first has a spiralling blue and yellow pattern and is said to be the most difficult of the bunch.

Just one out of every ten people was able to discover the concealed number in that illusion.

The second illusion, with a jagged blue and white theme, is a little simpler, but only a few people can solve it.

Almost one-third of those polled were able to locate the hidden number in that one.

Two more illusions are even simpler.

One has a splodgy, multicoloured pattern and appears to have been solved by half of those who attempted it.

The final one conceals the number behind wavy black and blue lines.

Nine out of ten people cannot find the number in that one if they look long enough.

“A hint to crack these tricky illusions is to zoom out or make the images smaller,” Jackpotjoy’s Alex Fagelson stated.

“Suddenly the secret number will be revealed! Good luck to everyone who cracks these tricky puzzles.”

SOLUTION: The hidden number is 20

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