An engaging optical illusion challenge asks participants to spot a hidden ’20’ among rows of ’02’ in under six seconds. Only 2% can successfully complete the task within the time limit, making it a rare accomplishment. This quick test of focus and visual acuity has become popular as people compete to find it the fastest. An engaging optical illusion challenge asks participants to spot a hidden ’20’ among rows of ’02’ in under six seconds. Only 2% can successfully complete the task within the time limit, making it a rare accomplishment. This quick test of focus and visual acuity has become popular as people compete to find it the fastest. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle