Only 1% of people can notice the difference in this image.

The internet is full of visual puzzles and brain teasers, and one of the latest challenges to capture attention is the so-called “eye test.” In this task, participants must observe how many times the letter “m” appears in a grid filled with the letters “n.”

At first glance, the grid seems simple enough—rows and rows of lowercase “n”s—but hidden among them are a few cleverly placed “m”s that can easily go unnoticed. This quiz tests your attention to detail, visual perception, and patience.

Why are these tests so popular?

Puzzles like these tap into our innate desire to solve problems and challenge our abilities. They’re also a fun way to break up the monotony of everyday life while simultaneously exercising the brain. Plus, there’s a special sense of satisfaction in finding a solution, especially when it seems impossible at first.

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