Test your vision with a captivating optical illusion that hides a number within a neon green circle. Besides being a fun challenge, spotting the hidden number 89 in seven seconds can enhance mental agility, problem-solving skills, and memory. This puzzle not only entertains but also provides cognitive benefits to keep your mind sharp. Test your vision with a captivating optical illusion that hides a number within a neon green circle. Besides being a fun challenge, spotting the hidden number 89 in seven seconds can enhance mental agility, problem-solving skills, and memory. This puzzle not only entertains but also provides cognitive benefits to keep your mind sharp. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle