Metro: Last Light's title is slightly misleading, since there's really nothing "light" about the game at all, at least according to the latest grim, Bible-quoting trailer. Hey, we never liked being happy anyway.

Along with that uplifting video, THQ is offering a free Steam key for Last Light's predecessor, Metro: 2033, to each person who "likes" the Metro Facebook page from December 11 - 16, while supplies last. There's only so much room in the THQ digital vault, after all.