Are your eyes sharp enough to spot the hidden number in this head scratching optical illusion?

DO you reckon you have sharp eyes and can spot small details?

A new puzzle is challenging people to find the hidden number in a red square.

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The optical illusion was shared on Twitter by teacher who said: “Eye test.

“What number do you see?”

You’ll have to be eagle-eyed to spot the concealed number as it blends into the red block behind.

So, do you have what it takes?

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The tweet has racked up over 565,000 views and people were quick to chime in.

One joked: “Migraine.”

Another added: “Is this one of those colourblind tests?”

And many people replied to the tweet to share which number they could see.

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The most common answer was 571 - so is that what you saw?

If that was too easy, however, why not see if you can find the delicious seedless slice of watermelon among this fruit salad.

In another cunning brain teaser, see if you can spot the hidden heart-shaped berry in less than three seconds.

This optical illusion challenges you to spot the correctly spelt word in less than ten seconds.

Or, try your luck and spot the rabbit hidden inside this picture in less than five seconds.