Anyone who wants to put their mind to the ultimate test through a difficult task should have a dabble at brain teasers.
From testing a person’s personality traits to the level of their IQ and their creative thinking, these tricky brain tests are a clever way to stretch someone’s brain to think outside of the box.
One newly surfaced puzzle tests the efficiency of someone's eyesight - with only those who have eyes like a hawk being able to see the hidden number within the allotted time.
READ MORE: You're of 'extraordinary intelligence' if you can spot the giraffe hiding in this picture
The brain teaser is simple - challengers must attempt to find the number 725 among the many 775s within the image.
Even though the task is relatively straightforward, it isn’t that easy to spot the missing number.
If you're struggling, it is advised that you scan every row as quickly as you can all the while keeping an eye on the number in the middle of the three-digit sequence.
Don't fret if you weren't able to spot the number 725 as we've labelled it clearly for you below.
Find the number and now you fancy another optical illusion? Well, people have been struggling to find the horse rider's face hidden in 15 seconds.
This difficult one can be tricky since you can only find the man if you rotate the image.
Another one doing the rounds on social media is an image that features a multitude of brightly coloured toy animals. Within the picture, there are lions, hippos, birds, elephants, deer and monkeys all of which are different colours such as yellow, pink, purple and orange.
Alongside all of these animals is a single giraffe (we can’t tell you what colour!) hidden in plain sight. While a lot of people may be unable to locate the giraffe, those with high IQ have been shown to be able to within 11 seconds.
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