India, Aug. 25 -- A new optical illusion puzzle is making waves on Facebook, challenging users to put their observation skills to the test. Such visual tricks have long fascinated people by encouraging them to question what they see, and this puzzle is no exception. Designed to test sharpness of vision and attention to detail, it has left many struggling to find the correct answer.

(Also read: Optical illusion: You have eagle eyes if you can spot the odd number in 10 seconds)

The image is simple yet deceptive. It is handwritten on ruled paper with the words "Test Your Eyes" written prominently at the top. Beneath that, the line "How many numbers." sets the stage for the challenge. At the centre sits a complex shape, where several digits...