According to Xbox-Achiv, the USK (aka the German ESRB) has rated Marathon: Durandal.
Marathon, if you haven't already wet yourself with glee, is a classic Bungie franchise. (Yeah, they actually made games before a man in green armor changed everything.)
Marathon originally debuted in 1994 on the Macintosh and completed the trio of releases in 1996. Halo owes much of its genesis to Marathon, so all you Halo junkies, get to learnin'.