Keeping your brain healthy and active is just as important as the rest of your body, and one of the best ways to do that is to regularly give yourself stimulating puzzles and challenges to complete.
Optical illusions and brain teasers are known to work wonders for our cognitive function by improving the brain's ability to perceive and interpret visual information, and while you might struggle with them at first, the more you practice, the better and quicker you'll be.
This new brain teaser is guaranteed to make you scratch your head as you have just three seconds to find the number 67 lurking in a sea of number 97s - and it's left even the sharpest minds baffled.
The brain teaser, from JagranJosh, features a picture full of rows of the number 97, but there's one key difference - one of the numbers isn't a 97 at all, but a hard-to-spot 67.
Can you find it?
You can take as long as you need to locate the number, but if you want to be able to proudly say you have the eyes of a hawk, you'll need to track it down within just three seconds - which isn't as easy as it sounds!
If you need help finding the odd number, here's a hint for you: the number you're looking for is in the top half of the picture, on the right-hand side. So you can ignore anything toward the bottom left.
Got it now? We're about to give you the answer, so if you're still looking for it, don't scroll any further!
The number was in the top right corner, on the second row, second in from the right.
If you'd like a rematch, then you can turn your attention to another number-based game like this one, where you have just eight seconds to find the number two.
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.
How did you get on? Compare your results in the comment section below...
