New Delhi, June 25 -- Tricky optical illusions not just help in sharpening the mind, they put your problem-solving skills to the test. These puzzles make people think out of the box and come up with creative solutions. One such visual puzzle is getting viral on social media, asking viewers to locate some characters in a crowd. The challenge is inspired by one of the most relatable problems people face when they attend a festival or event- finding their friends in a packed crowd.

Anyone who has been to a festival knows the value of a standout flag. It is often the online thing that helps you find your friends. The challenge here is to figure out the standout flag in the photo in less than 40 seconds.

Look for a flag with a disco ball in ...