On Wednesday and Thursday only, 360 owners with Gold subscriptions will get to download a free multiplayer beta of Phantasy Star Universe. FiringSquad notes that people who grab the beta will be able to play the game until October 18th. The full version of Sega's online RPG comes out on the 24th. In addition to online play, the retail game will come with a single-player adventure starring Ethan Waber, a rebellious teenager who has to defend his sister from an alien invasion. The aliens turn out to have a connection with ruins of an ancient civilization.