control the sprite on the left you must press (right arrow) and every time you press (right arrow) it also changes the back drop. Then for the one on the right is the same thing but with the (left arrow).and to stop the character your using press space to stop the sprite your using..... oh I almost forgot if you press the character on the left first he says something then you can press the one on the right before starting the project who's gonna reply to that character....