Self-playing Super Mario World levels have been around for a while now; the editor for the SNES SMW ROM has been with us for almost a decade now. Three years ago, Joystiq did a pretty good rundown on them. Recently, however, I was introduced to what I think is the alpha and omega of the self-playing Super Mario World genre. It's a four-part harmony set, appropriately enough, to Queen's "Don't Stop Me Now." The amount of skill and coordination it took to do not only do this, but do this and make it look as awesome as it looks, is staggering.