Many young people today play video games, much to the disgust of their parents. These games have their own settings, often different from the one that we live in. These different settings are great places for stories to be written.
That's what this group is about. Why create an entirely new universe, like the one in Halo, when it already there to be used? The game developers created the universe for people to enjoy, and what better way to enjoy it than writing about it (well, besides playing the game)? So, let's take some successful (or not so successful) games and bend them to our wishes. Who knows, we might even make a better storyline.