The Guinness World Records organization acknowledges that Fallout: New Vegas, the video game created by developer Obsidian and published by Bethesda, has the most lines of dialogue in a single-player experience.
The official count of the World Guinness Book of Records
says that there are 65,000 lines of dialogue in the video game.
Fallout: New Vegas is a first-person open-world game which allows the player to create a complex character and then start as a left-for-dead courier before gaining power and skills in order to deal with one of the most powerful forces in the post-apocalyptic world.
At the moment, Obsidian is working on Project Eternity, a classic top-down party-based title, which will be launched in 2014 and might challenge New Vegas for the Guinness World Record.