Brainteasers are puzzles or challenges designed to test your problem-solving skills, creativity and logical thinking.

They often require you to think outside the box and approach the problem from different angles.

These types of puzzles can range from riddles and word games to mathematical problems and visual puzzles.

Experts at MyExcelOnline have shared a unique puzzle to keep the sharpest minds on their toes.

Using a Google Sheet, they have filled the page with the word "November" over and over, but one of those words is different.

And it’s up to you to spot it within 20 seconds.

This puzzle features several rows of the word "November," and your task is to spot a subtle difference in spelling.

At first, the words may appear identical, but with a closer look, you'll notice the one that stands out.

If you haven't spotted it yet, don’t rush—it's not hidden, just cleverly blended in. Once you’re ready, look above for the answer.

Brainteasers are meant to stimulate the brain, encouraging mental flexibility, sharpness and concentration.

They're popular in social settings, education and as a fun way to exercise cognitive abilities.