Alright. First, classes do not have images. You can, however, set a default image (in Greenfoot) for objects created from that class. It is the actor objects (and world objects) created from the classes that have images. Therefore, you cannot, even if 'getLeft' was a defined method, use it on a class. You need to use it on a specific object created from that class. Now, if you did have a specific object that you needed to know the location of the left edge of its image, you would use something like to following: I am presuming that the world cellsize is one (or you probably would not need this code). 'getX' returns how many pixels away the center of the image of the actor is from the left edge of the world. 'getImage().getWidth()' returns how many pixels wide the image of the actor is. So, the x-location of the actor minus half the width of the image of the actor should be the x-location of the left edge of the image of the actor. If there is only one instance of a class, you can get a reference to it with the following: This 'get's the one, and only, instance of a PurpMin object that is in the world and assigns it to a new local field called 'purpmin'. Then, you can use 'purpmin.getX()' and any other Actor class method.