Interesting way to use the robots. They also have photos & videos along with other details.
'Three computer scientists at Colorado University programmed several Roomba robotic vacuum cleaners to act like Pac-Man and the ghosts which chase him. Jack Elston, Cory Dixon, and Maciej Stachura did so in order to demonstrate the unmanned aerial system that they are developing. Click on the link for more videos, pictures, and schematics for this project.' — http://www.neatorama.com/2009/11/09/roombas-playing-pac-man/