Optical illusion: Only a person with high IQ can focus and spot the mistake in 7 seconds

Do you enjoy brain challenges that test your observation skills? Here’s an optical illusion that’s going viral for one simple reason — it looks easy, but only a few people can actually spot the mistake in it. If you think you’ve got a sharp eye and a high IQ, this one’s for you!

At first, the image looks like it’s filled with the number 55, repeated and arranged neatly in rows and columns. It's so well aligned that it almost feels like your eyes are scanning a spreadsheet.



But here’s the twist — something is not right in this image. There’s a mistake hidden in the left side corner, and your task is to find it in just 7 seconds.


Well, don’t be too sure. This puzzle is trickier than it seems!

Set a timer and take a good look at the image. Scan the left side corner carefully.
Tick-tock...

If yes — congratulations! That means you’ve got a sharp brain and high attention to detail. These are qualities that experts say are often linked to high intelligence and strong problem-solving abilities.
If not, don’t worry. Most people actually miss it on the first try. Want to know the answer?


The image may look like it’s only filled with 55, but if you focus carefully on the left corner, there’s one sneaky number hiding in plain sight: the number 5 — not 55 — is placed among all the 55s!
That’s right. A single-digit 5 has been slipped into the image, and it tricks your brain because your eyes are expecting a pattern. This is called pattern recognition bias, where our brain automatically assumes consistency and ignores tiny variations.