Could this have to do with Googles ARG Endgame[1]? It seems just cryptic enough to fit the bill.
[1] http://www.theverge.com/2014/10/7/6927605/welcome-to-endgame...
[1] http://www.theverge.com/2014/10/7/6927605/welcome-to-endgame...
also found the rhgame reference in css...