India, Sept. 8 -- Optical illusion games are always fun as they test how sharp our observation skills are. The latest puzzle has left netizens scratching their head. At first glance, the puzzle looks simple, but in reality, it is tricky. The challenge is, in a grid on a black background, every box has 4 letter words that look the same but with a twist. Hidden inside the grid is one misspelled word, "Fich." You only have 10 seconds to find the hidden word in the sea of "Fish."

The difficulty comes from the way our brain works. Human brains are naturally wired to recognise patterns. Whenever there is a repetitive word, our brain quickly assumes that all the words are the same. This is why we often overlook small differences in words, like ...