Halo 3 - Master the Multiplayer

VALHALLA (download guide)

Bungie says: "The crew of V-398 barely survived their unplanned landing in this gorge... this curious gorge. 6-16 players."

GamesRadar translates: The mountainous valley you remember from the beta. The Wraiths and Ghosts that sporadically spawn behind the towers are worth waiting for... you'll get tons of frags before anyone takes you down.