James Cameron’s Avatar: The %%10%%Game has been shrouded under a dense layer of secrecy second only to the one that surrounds the movie it’s based on. For those who haven’t been following the film, Avatar follows the conflict between the denizens of a planet called Pandora, the Na’vi, and humankind, who are essentially strip-mining their world to disastrous results. The games based on the film have basically complementary stories that offer a close-up look at the conflict. But, outside of a demo …