CNGtro is the first demo from CNGsoft, and the first "official" 4k on CPC. It was released at Ze Meeting 2003 contest. We can consider it as a remake of Eliot's part in Croco Channel Demo. The main effect is based on an efficient optical illusion, showing some logos moving on a vertical wave. Note that there is also a moving background, and a slight color fade on the logos. At the center of the screen, CNGsoft is talking to you in a small scroller.