We all know that keeping our brains healthy and active is important, but knowing how to do that isn't always easy, especially when you can't give your brain a workout in the same way you do your body.
However, there is one method that's proven to boost cognitive function and brain power - solving tricky brain teasers, optical illusions, and other puzzles. While you might struggle with challenging puzzles at first, the more often you practice the better you'll become, and before long you'll be solving genius-level brain teasers in no time.
So if you're looking for a way to test your brain power, why not try your hand at this puzzle that's been leaving people scratching their heads? All you need to do is find the number 474 that's hiding somewhere among the 444s.
Take a look at the image above. It might not seem like it at first glance, but there's one number in the picture that isn't the same as the rest of the rows of 444s.
But if you take a closer look, you might be able to spot the odd number, 474, lurking somewhere in the picture where it doesn't belong. According to Freshers Live, you could have perfect vision if you manage to spot the odd number out in just 20 seconds - so how quickly can you find it?
Don't worry if it takes you longer than 20 seconds to find the number, solving the puzzle in any length of time is an accomplishment, and taking a little more time to get to the answer just means you need to keep practising.
And if you need a hint, let us give you one: You need to focus your search on the left-hand side of the picture, so you can ignore anything that's on the right as you won't find the number there.
Got it now? We're about to give you the answer, so if you don't want to know just yet, don't scroll any further.
You can see where the number was lurking in the image above.
If you're looking for more puzzles to test your skills, why not try another number-based game like this one, where you have just eight seconds to find the number two in a sea of other digits?
There are many similar puzzles that use words instead of numbers, such as this one that challenges you to find the word 'cold' among the 'gold's, or another that hides the word 'bare' in a sea of 'bear's.
For players who prefer image-based challenges, why not try this waterpark-themed brain teaser? In a mind-bending twist, you're searching for the blue rubber ring, nestled somewhere between the aquamarine swimming pools.
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