Happy bleak post-apocalyptic holidays! Hardware giant Nvidia is giving away free digital copies of Metro 2033 in exchange for hitting the "Like" button on its Facebook page . The promotion lasts until into Christmas Eve.

4A Games' atmospheric shooter is one of many high-quality games, such as Portal and Amnesia: The Dark Descent, that are turning up in sweeping sales events and bundle sales at a heavy discount. Its upcoming sequel, Metro: Last Light, took a few delays as THQ struggled with financial difficulties, but it still seems to hold the same excellent scares and Russian expletives as its predecessor.