Fallout: New Vegas is a 2010 action role-playing game that was developed by Obsidian Entertainment and published by Bethesda Softworks. The game, which was released for Microsoft Windows, PlayStation 3, and Xbox 360, is set in the Mojave Desert 204 years after a devastating nuclear war. The player controls a courier who survives an assassination attempt, and becomes embroiled in a conflict between different governing factions that are vying for control of the region. Fallout: New Vegas features a freely explorable open world, and the player can engage in combat with a variety of weapons.
https://en.wikipedia.org/wiki/Fallout:_New_Vegas