Only if they run the program locally using the Open in Greenfoot button, you would have to include the source. You would have to wrap it with a try/catch b lock since it will not work in applet form, unless the user grants special privilege to the applet to write to the local file system, but, I do not know too many people willing to allow that. The Userinfo class is a great thing.
Kay, lordhershey. Thanks, I don't think I'm going to do that since I'm planning to distribute the game on my website. I'll try and find another way to make the users happier :D