New Delhi, July 4 -- Think you have the sharpest eyes in the room? A new optical illusion puzzle is puzzling the internet. The brain teaser has dared users to spot one sneaky number that is hiding in plain sight. Among dozens of nearly identical numbers, the odd man out is carefully camouflaged and the mission is to find it in just seven seconds.

The viral visual challenge has become a favourite when it comes to testing one's focus, attention to detail, and visual agility. At first glance, it comes across like a sea of repeating digits but a closer look will show you something that is not quite right.

Also read: Optical illusion test: Need eagle eyes to spot '183' in 8 seconds

An X (formerly Twitter) user posted the optical illusion on...