Roll a ball is about as simple as it gets. Things are only explained as needed and it doesn't go into too much detail, which is good. It does give you the ability to drill down if you want however and the introduction to the CTRL - ' (Single Quote) shortcut seems like it will be most useful. This project also feels like something I'll be coming back to when I start to create my own projects as a reference. How did I do that? Oh yea, let me look back at Roll-a-Ball I remember doing something like this.