The game features a Firefight mode, a four-player cooperative game mode that is centered around the campaign. Rather than the hardcore sci-fi of previous editions, ODST has influences of film noir and jazz-like elements to complement the soundtrack. Halo 3: ODST also includes Halo 3: Mythic, which is essentially a stripped-down, multiplayer-only version of Halo 3, and includes all Halo 3 downloadable maps, including Heroic, Legendary, and Mythic map packs and three previously unreleased maps.