After finishing the fight with Master Chief in Halo 3, players now have the opportunity to take a step back in time and experience the Halo universe from a whole new perspective. Players are put in the boots of an Orbital Drop Shock Trooper, some of the toughest and bravest soldiers of the UNSC. Players must search for clues to find out what happened to their squad when a drop into the city of New Mombasa goes wrong, and discover the secret behind the Covenant's interest in the city. In addition to a full-fledged campaign, Halo 3: ODST introduces Firefight, a new cooperative multiplayer mode where up to four players battle waves of unrelenting Covenant onslaughts.