ANIME REVIEW: “.Hack//Sign: The Complete Series” – IndieWire

hack//SIGN (TV Series 2002–2003) - IMDb

Tsukasa, .hack//Wiki

hack//Tasogare no Udewa Densetsu - Anime - AniDB

Review] hack//SIGN: The Complete Collection

hack (Franchise) - TV Tropes

Hack/Sign - Rotten Tomatoes

Second Life Marketplace - .Hack//Sign - Key of the Twilight CD (boxed)

dothack #sign .hack//Sign #bear #mimiru #tsukasa

hack//Roots - Anime - AniDB

The best gaming anime of all time is .hack//SIGN, and it's now streaming - Polygon