
This game is rated ESRB: Teen for Mild Language, Violence and Mature Sexual Themes.
.Hack//Mutation is a 2002 role-playing action-adventure game developed by CyberConnect2 for PlayStation 2 and the second installment in a four-part series following .Hack//Infection. The game simulates a fictional MMORPG called The World without requiring an actual internet connection, placing players in the role of Kite as he investigates why certain players have fallen into comas after playing The World. That investigation gradually expands into a broader examination of The World's influence on internet stability at large. As part of the multimedia Project .hack franchise, the narrative continues from the anime series .hack//Sign. Character data and progress can be carried over between all four games in the series. Each copy includes a bonus DVD featuring an episode of .hack//Liminality, an original video animation that depicts concurrent fictional events running alongside the main storyline.
Kite and BlackRose return to Θ Chosen Hopeless Nothingness but find part of the area locked off. After a quick intervention with Balmung, the two return to Dun Loireag, where Kite is told that his Book of Law he won from the Level Up Campaign has an error that prevents it from being installed, so it is replaced with the Book of Absolute (which also cannot be installed). BlackRose claims to have never heard of the event. The two receive e-mails telling them to come to Θ Soaring Sky Bounded Abyss if they want to know more about the coma victims. It is actually a trap set up by system administrator Lios. Lios says that they should not pursue the matter any further and proceeds to delete Kite's character data along with the bracelet. Helba, however, interferes, saying that they cannot be deleted because of a mysterious encryption implanted in their character data. She introduces the theory that The World is based on the Epitaph of Twilight, telling the two to look to the Epitaph for clues. She then suggests to Lios to observe the two rather than try to delete them. Lios eventually agrees, deciding to use the two and the unique abilities of the bracelet to investigate the corrupted areas.

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