Played both right here. Liked both of them, AI 2 is the prequel to the 1st, while the 3rd one is a different story/universe most likely. Also, AI 3 is like a prototype for Mana Khemia, if you've played that before.
Since you liked the first one, give them a shot.
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Chant the name of BlAcK TuRtLe, winner of the 2010 Guru Challenge!
NEXT TIME!