If you're feeling bleary eyed this Monday morning after too much fun in the sun over the weekend, why not challenge yourself to a tricky brain teaser to get the new week off to a flying start.
A coffee will certainly give you a classic caffeine boost, but optical illusions are also a great way to invigorate your brain as they force you to hone in on your perception skills, and test your ability to spot hidden objects.
If you fancy yourself as someone with a brilliant attention to detail and impressive cognitive ability, you may be able to crack these tough puzzles without breaking a sweat. But even the biggest of brain whizzes can find themselves scratching their heads when the optical illusion code feels impossible to crack.
The latest puzzle to try with friends and family challenges you to find a hidden number in this neon-coloured illustration. But that's not all - players are on a strict time limit in order to declare themselves as true geniuses.
The bright brain teaser boasts a sea of digits, all of which appear to be the number 58 at first glance. However, on closer inspection you should be able to decipher a rouge number amongst them, as a sneaky 38 has been hidden somewhere in the image.
You've got just 10 seconds to spot the sneaky 38 buried in the sea of 58s, which is no small feat - even for the brainiest among us.
If you need a helping hand, remember that optical illusions often play with colour contrast to trick your eyes and brain into seeing things that aren't there - or not spotting things that are.
The neon hue might be throwing your noggin' into a spin, but keep trying and you'll crack it eventually.
If you found the hidden number within the time limit, give yourself a big pat on the back. You've essentially won Monday already. For anyone still struggling to spot it, fear not, as it's still a good mental practice to help set you up for a productive week.
If you're desperate to find the answer, we've done the hard work for you and highlighted where the hidden 58 is below.
It's the 11th number on the second row of digits in the busy image, and will feel frustratingly obvious when you finally spot it.
For anyone looking for more mind-boggling challenges, there's plenty to try, including one that challenges you to stop the spirals from spinning (ouch).
Another number-based quiz urges you to find the number 725 among the 775s, and anyone who finds it in seven seconds has eyes like a hawk.
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