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Project Nevada is a mod aiming to make Fallout: New Vegas a more interesting - eventually more challenging - but surely more fun experience for you. Created by the team responsible for the Fallout 3 Wanderers Edition (FWE), they're leaving the barren DC wasteland behind and move on west to new, exciting regions.
This mod requires the Fallout: New Vegas Script Extender, and the Fallout Mod Manager is highly recommended.