At Burning Man a few years ago they had a massive Rubik's cube installation. There were 3 control points spread around the cube, and the people at the control points had to collaborate to solve the puzzle. Very cool.

http://www.youtube.com/watch?v=5IdX6UlClGg (Unfortunately the video is side-on, but you get the idea)

And it was solved: http://www.youtube.com/watch?v=7GC13nB_P7A