Think you’ve got the sharp mind of a top mathematician? This viral brainteaser is putting readers to the test, and only those with exceptional attention to detail can spot the odd number hiding in a sea of identical digits within just 12 seconds. At first glance, the puzzle seems simple: endless rows of the number 76 printed on a bright green background. But lurking somewhere in the grid is a single odd number that doesn’t belong. The challenge is that the uniform layout tricks the eyes, making it harder to scan freely and detect even the smallest deviation.

And no, you don’t need complex maths or trigonometry for this one, just sharp vision and a quick mind. The trick is to focus less on the grid and more on the shape of each digit. If you’re struggling, here’s a hint: pay extra attention to the number 6. Any alteration in its shape might reveal the intruder.Solving puzzles like this does more than give you a moment of fun. Optical illusions and brainteasers stimulate multiple areas of the brain, boosting mental flexibility, sharpening problem-solving skills, improving memory, and enhancing focus. Psychologists suggest that illusions may help improve eyesight by training the brain to catch tiny details. If you haven’t spotted the odd number yet, don’t worry, the answer is included below the puzzle. And once you’ve cracked it, you can challenge yourself with more illusions, from locating a sneaky lemon to spotting a time traveller hidden in a crowded park scene.

Credits: The Irish Sun