Wow! It's been a long time since I last posted!
Here is an app that is a little more than just a casual game: it is something that I certainly shall be using frequently as a teaching aid. What started off as an experiment to explore various techniques of dynamic file creation, uploading and saving - all without communicating with a server - ended up in an almost full-fledged smart-board or drawing tablet app.
Click here to start the app.