What is the Optical Illusions? Optical illusions are the side of the illusion, that is, the illusion of the eye. The goal of the game is to hypnotize yourself and your friends. Follow the screen for 30 seconds at a distance of 25 cm and then look at a flat, unlit area. You will see the same shapes as you see on the screen. How to use? There are a total of 27 illusions.