New Delhi, July 3 -- The mind-boggling optical illusion for the day has kept many confused on the internet. Even the seasoned puzzle solvers are finding it extremely hard to find the number '183' in one go. Only a handful of eagle-eyed enthusiasts have been able to find the missing key within the required time. Do check this one out by putting your brain and eyes to the test.

These well-crafted optical illusions make perfect use of colour, light or patterns to check your visual abilities and mental strength. Questioning the inner psyche, such fun games are a great way to understand self- awareness skills.

Among the top trends on the internet, optical illusions have their own fan base. Blurring the line between reality and illusion, such...