These visual challenges help keep your brain more active. A viral challenge shared via Facebook has become the ‘nightmare’ of users for presenting a high level of difficulty. The challenge is to look at the photo closely to locate the four old keys; However, it is not as simple as it sounds, as you should do it in the shortest possible time.

Although in appearance it seems a simple task, it is difficult among so many similar KEYS. Do you want to try? See the image below, where all the keys are, look for the four old ones.

IQ, short for intelligence quotient, is a measure of a person’s reasoning ability. … IQ tests begin to assess this by measuring short- and long-term memory. They also measure how well people can solve puzzles and recall information they’ve heard — and how quickly!

Did you manage to find the four old keys? how long?