He gets stuck on walls, also in the air when he does his little 10 pixel jump. Here's a very basic way to make your character turn when he's moving. Assuming you have two images, imageOne and imageTwo. GreenfootImage RightOne = new GreenfootImage("imageOne.png"); GreenfootImage RightTwo = new GreenfootImage("imageTwo.png"); GreenfootImage LeftOne = new GreenfootImage("imageOne.png"); GreenfootImage LeftTwo = new GreenfootImage("imageTwo.png"); public character() { /** * Mirror the images for moving right horizontally. **/ RightOne.mirrorHorizontally(); RightTwo.mirrorHorizontally(); } public void move() { if(Greenfoot.isKeyDown("right")) { setImage(RightOne); setLocation(getX()+2, getY()) setImage(RightTwo); } if(Greenfoot.isKeyDown("left")) { setImage(LeftOne); setLocation(getX()-2, getY()); setImage(LeftTwo); } } That's reallly basic but it should work.

You might like to watch the "Platform games: running, falling and jumping" video tutorial here: http://www.greenfoot.org/doc/videos.html