You have no shadow in a dark world. You need to explore what's going on in your shadow and discover the secret. There are two modes of play. In random mode, your goal is to find the violet portal, trying not to be detected. In the shadow mode, you can teleport where you click on the screen. Have fun with Shadowless Man.
AD or left/right arrow to move, Spacebar to toggle shadow mode, Left mouse button to create illusion or teleport.