I can't embed it; it's in the form of a video at this link.
I've blogged this in order to use it to entertain family and neighborhood kids. But to make it work, you need to see the introductory companion video, the link to which I have temporarily lost. I'll find it shortly and then revise this post.
Addendum: Thank you, loradona, for finding the link. Here is the video that explains how to use the one at the link above: