I see, that you have the same problem, as me. The image of your knight turns a kind of red, when walking to the tight. Perhaps it's the problem, that you saved the images as JPEG's.

Ok, da war meins viel schlimmer: public final CActor getOneIntersectingObject(Class clss){ List<CActor>cactor = super.getIntersectingObjects(clss); for(CActor c : cactor){ for(int y = getY()-getHeight()/2; y < getY()+getHeight()/2; y++){ for(int x = getX()-getWidth()/2; x < getX()+getWidth()/2; x++){ for(int cy = c.getY()-c.getHeight()/2; cy < c.getY()+c.getHeight()/2; cy++){ for(int cx = c.getX()-c.getWidth()/2; cx < c.getX()+c.getWidth()/2; cx++){ if(x==cx && y==cy){ GreenfootImage a = new GreenfootImage(getImage()), b = new GreenfootImage(c.getImage()); a.rotate(getRotation()); b.rotate(c.getRotation()); int ix = x-(getX()-getWidth()/2), iy = y-(getY()-getHeight()/2), icx = cx-(c.getX()-c.getWidth()/2), icy = cy-(c.getY()-c.getHeight()/2); if(a.getColorAt(ix,iy).getAlpha()>50 && b.getColorAt(icx, icy).getAlpha()>50) return c; } } } } } } return null; } Dann werd ich wohl lieber deins verwenden. Danke :)