Yes I read Learning Processing chapter 9 but I seriously don’t know how to apppy to this assignment. The assignment requires to have many invaders at a time on the screen but at first there is only one, and then the next one appears after the first one has moved 70 pixels to the left, then the same happens again. If the player obliterates one, then the ones to the right will move forwards to the gap. I don’t know how to initialize the array in this case as this is an array of “showNumber” function, and the length is undefined.