Only people with the sharpest vision can spot all 5 pumpkins in less than 30 seconds

An full of is testing people's powers of observation, just in time for .

In the colourful illustration, an autumnal market scene is shown with three stalls selling , vegetables and bread. A couple of choosing what to buy are in front of them and with a few plants also dotted around, plus a wheelbarrow and sign. The aim is to spot all five pumpkins that are fiendishly hiding somewhere within the picture, which is a lot harder than it sounds at first glance. The puzzle's creators believe that it takes a reader an average of 30 seconds to find all of the elusive fruits.

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The from is like many puzzles that often leave people scratching their head as they challenge cognitive abilities and sometimes require a little thinking outside the box. In this case, don't worry if you can't find every pumpkin inside 30 seconds or not as the answer is revealed further down the page.

The Dean McGee Eye Institute said regarding optical illusions: “There are occasions when the brain is unsure of what it sees. Optical illusions occur when your eyes are presented with colours, lights, patterns, borders or areas of contrast that mislead the brain. It tries to piece together images using optical clues, learned assumptions and past visual experiences. In these cases, there is a difference between the reality of what you see and what your brain thinks you see. As a result, your brain makes a guess and is tricked into seeing something that does not exist, or it struggles to decide between alternating versions of an image.” Although puzzles like this are just a bit of fun to help pass the time, there is also evidence that brainteasers can be good for your cognitive health. Taking on and completing difficult tasks like these could help increase your productiveness and memory.

Aaron Seitz, PhD., professor of psychology and director of the Brain Game Centre at the University of California in Riverside told Real Simple: "Studies show that staying mentally fit is important for long-term cognitive health, but the difficulty is figuring out exactly how to do it. If you think about diet and exercise routines, some things work better for some people than others, and the same is true with brain games."

While Nicole M. Avena, PhD, assistant professor of neuroscience at the Mount Sinai School of Medicine in New York City and visiting professor of health psychology at Princeton University added: “While some studies show that brain training games are not effective, the recollection and work that the brain does during these games keeps your mind fresh and alert… Brain functions that you practise during these games—and the repetition of them—can help improve response time and sharpness.”

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