This new outlook on life forces players into a dangerous open world, where giant radioactive creatures roam the countryside, andRaiders, slavers, super mutants, and ghouls vie for control of territory and resources. Combat and conversation remain the primary means of advancing the storyline, with mercenary missions and random battles providing for character advancement, and the V.A.T.S. targeting system and branching dialogue of Fallout 3 returning unmolested.Obsidian has added a number of its own flourishes, led by a new reputation system that builds on the franchise's established Karma mechanic, continually updating gamers' standing among the wasteland's various settlers and warring factions. Companions also take a larger role, as players can now form a party, pass off weapons and items to friendly characters, and instruct their squad mates whether to be passive or aggressive in combat situations. Gamers also have more battle options thanks to new weapons, modifications, and special attacks; and the Nevada Wastes landscape is just as treacherous as the similarly sized Capital Wasteland thanks to militant factions and ferocious new beasts. Fallout: New Vegas also includes a "Hardcore" mode that operates outside of standard difficulty levels, and is designed to ratchet up the realism by giving ammunition weight, requiring players to remain hydrated, and making wounds heal gradually rather than instantly.