East of Thebes
I think the best literally translation would be "Beyond Thebes". But the german name sounds very similar to the name of the movie "Jenseits von Eden" (intentionally, i assume), whose original title was "East of Eden".
I think the more usual term in a German Bible for the country where Adam and Eve settle down after they were thrown out of Paradise is "jenseits von Eden", so the translator of the Steinbeck novel quoted the German Bible. Maybe the translation changed in the last decades, but they left the title of the novel as it was.
BTW, a silly name for the game, which is beautiful.
Aha! That explains things. So it's basically a play on words (like Ohne Furcht und Adel). I just knew there was something I was missing about why this game would be called "Beyond Thebes", and that explains it.
Thanks to everyone who helped sort out this riddle.
I'm sure looking forward to getting a copy of this, whatever it's called!