Edit: There's now a how to guide for you to work through to set this up.

I've been getting a demo up and running for Maker Faire with the mBot robit and MappyDots:

There is an extension for scratch which will be on the repo shortly, which allows you to connect a few MappyDots up to the mBot, to get it to drive around and avoid running into your legs or run away from your cat.