Just use the left and right arrow keys to move the "heffalump" (elephant).
The project uses just one variable to record the "heffalump" position. It renders the heffalump TWICE (with pen's "stamp" function) to achieve the "wrapping" effect. The point is that, in the general case, one "game object" can imply multiple renderings. BTW, "heffalump" for elephant is from "Winnie The Pooh".
