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 something to test your IQ, why not try your hand at this new challenge? All you have to do is find the number hidden among the rows and rows of Bs.
You might think this puzzle, created by the contact lens specialists at Lenstore, is easy - after all, it should be simple to find a number among a sea of letters since they're two very different things, right?
But the more you look at the teaser, the more confused you might find yourself, as the number you're looking for seems to blend in perfectly with the Bs. We promise it's there, you just have to look harder!
We'll give you a hint if you're struggling - the number you're looking for is toward the right-hand side of the image.
We won't tell you what number it is that you're supposed to find, but have a think about what digits might be easiest to conceal among rows of Bs. It's definitely not the number 4!
Have you got it now? According to Lenstore, you need to find the number within 36 seconds if you want to tell people you've got "eagle eyes", so if you haven't found it yet - hurry up!
We're about to give you the answer, so if you don't want to know just yet, don't scroll any further.
Did you manage to find it within the time limit?
In the mood for more puzzles? 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?
While there are also 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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