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.
