More info on their website.https://www.youtube.com/watch?v=7JHtX2JwZAY
OMFG, I see this, just after
OMFG, I see this, just after posting this obviously Packman-inspired game that I am doing:
https://www.robotshop.com/letsmakerobots/node/12545
Well, at least I am making my own game 
But still… the basic idea of robotsd acting like an old computer game is the same
Interesting navigation solution
The linked site mentions something new to me: the Hagisonic Stargazer system.
It uses a powerful IR emitter and a camera. One or more passive IR beacons (reflectors) are placed on the ceiling. The camera plus image interpretation algorythm determines position and orientation.
Too bad it costs $1000 per robot.
very cool… also
very cool… also expensive… but cool