It must be 900 for wide and 540 for High if i remember right

Let's try a different way. What are the dimensions of your "Unknown.jpeg" image?

251x200

Really ??? No wonder it won't scroll !!! In your Sky constructor, adjust to the following:

I did it but it didn't change anything

public class Sky extends World { int bgWide = 1200; int bgHigh = 540; public static final int WIDE = 930; public static final int HIGH =540; public static final int CELL =1; Scroller scroller; Actor Megaman; public Sky() { super( WIDE, HIGH, CELL, false); GreenfootImage bg = new GreenfootImage("Unknown.jpeg"); int bgWide = bg.getWidth(); int bgHigh = bg.getHeight(); scroller = new Scroller(this, bg, bgWide, bgHigh); Megaman = new Megaman(); addObject(Megaman, bgWide/2, bgHigh/2); scroll(); Spawn(); } public void act() { if (Megaman != null && Megaman.getWorld() == this) scroll(); } private void scroll() { int dsx = Megaman.getX()-WIDE/2; int dsy = Megaman.getY()-HIGH/2; scroller.scroll(dsx, dsy); } That's my code if it helps u spot the problem

Remove those two lines you just added. Below in 'public Sky()', modify these lines: