It's what came out before the game was finished. Things looked different to what they are now and plus there was only Valhalla, High ground and a few others. Before the beta there was an alpha...
A Beta is a demo of a game released to show gamers the extent of the game. Most Halo titles have had Beta demos such as Halo 3, Halo 3: ODST, Halo Wars and the new Halo Reach Beta which comes out on...