A FASCINATING brainteaser is an easy way to keep your eyes and your mind sharp.
How observant are you feeling today? We have the ideal way to find out.
Racing against the clock to solve a puzzle can be exhilarating, and this brainteaser should keep you on your toes.
In the puzzle, German author Gergely Dudás, who also goes by Dudolf, transports you to a soothing blue landscape and surrounded by green bottles.
It's populated by three friendly dolphins who are enjoying the water.
The dolphins have collected a number of green bottles, almost all of which are filled with messages.
Among the filled bottles, however, are five interlopers which are empty.
The challenge is to identify the five empty bottles that are floating in the water.
The catch is that you have to do it in under 15 seconds.
That gives eagle-eyed readers just three seconds to find each empty bottle visible in the water.
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If you achieve that goal, your vision is so good that it must be 20/20.
Go over the 15-second time limit and sadly you'll have to start again.
If you're finding the challenge too tough, we can offer you a helping hand.
Firstly, take a good close look at what the scrolls filling most of the bottles look like, so your eyes will be quick to notice their absence.
Secondly, it's important to note that the empty bottles are spread out throughout the image rather than clustered in one place.
Two bottles are sneakily hiding behind two of the dolphins, so checking the bottles behind all of the sea creatures is a good idea.
Another empty bottle is hiding in plain sight almost in the exact center of the brain teaser.
The final two bottles can be found at the top left and bottom left of the image, respectively.
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