If you're in need of something to give your brain a boost as we near the end of the week, a good brainteaser might just do the trick.
They're great for sharpening your focus and improving your perception skills, and there are so many to choose from - but nothing will get your mind working better than when you're trying to beat the clock and solve it.
And one of the latest brain teasers challenges eagle-eyed players to crack it and spot the hidden word in just five seconds or less if you want to win.
So if you're up to the task, get your timers at the ready and take a look at the sea of words below. At first glance, they all look like the word 'zeal', but there's a rogue 'seal' hidden in there that players must spot.
The Mirror reports that you'll need incredibly sharp eyesight to find the odd word out, and even more so to find it in the required timeframe.
If you need a helping hand, remember optical illusions often play with colour contrast to trick your eyes and brain. The question is: were you fooled?
For those who want to improve their skills even further, we have plenty more brainteasers that are designed to do just that.
Try your hand at this one, for example, that challenges players to find the hidden number 38 among the 58s within 10 seconds.
Or, another numbers-based illusion includes an odd number of 725 hidden in a sea of 775s, and only those with the sharpest eyesight can spot it.
Practise makes perfect when it comes to brainteasers, and you get a real sense of achievement when you've managed to crack one.
But if you're still stuck on finding the hidden 'seal', we've given you the answer circled below.
Not only are the puzzles entertaining and fun - especially if you're winning - players can also reap a number of health benefits.
Regular play can improve your problem-solving skills and your memory. The games could even help to reduce your risk of dementia.
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