I believe this would be the correct order: * The World -.Hack//AI buster (Novel) -.Hack//AI buster 2 (Novel) -.Hack//Sign (28 Episode Anime) -.Hack//Infection (Part 1/4 Ps2 .Hack// Quadrilogy) -.Hack//Mutation (Part2/4 Ps2 .Hack// Quadrilogy) -.Hack//Outbreak (Part3/4 Ps2 .Hack// Quadrilogy) -.Hack//Quarantine (Part4/4 Ps2 .Hack// Quadrilogy) -.Hack//Liminality (4 Episode Anime) -.Hack//Another Birth (Novel) -.Hack//XXXX (2 Volume Manga) -.Hack//Legend of the Twilight (12 Episode Anime and 3 Volume Manga) * The World R:2 - End of The World (Recap) -.Hack//G.U. Roots (26 Episode Anime) -.Hack//G.U. Rebirth (Part 1/3 Ps2 .Hack//G.U. Trilogy) -.Hack//G.U. Reminisce (Part 2/3 Ps2 .Hack//G.U. Trilogy) -.Hack//G.U. Redemption (Part 3/3 Ps2 .Hack//G.U. Trilogy) -.Hack//G.U.+ (5 Volume M