 If you liked
.hack//Tasogare no Udewa Densetsu
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 ...then you might like
Yu☆Gi☆Oh! Duel Monsters GX
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More light-hearted than their predecessors, GX and LotT provide endearing characters and whimsical situations. Don't watch these if you're expecting the same feel as the ones before them- you WILL be disappointed. However if you'd like to delve deeper into a franchise about gaming these are two anime that offer a warmer approach to their respective, seemingly darker genres.