sonic adventure 2 was one of the most popular games on dreamcast and one of those reasons was because of the two new characters added especially shadow the "evil" sonic. basicaly what sonic would have looked like if he was a goth. and rouge the bat was very popular aswell. a gothic version of amy in my opinion. rouge was introduced as a rival for knuckles but later on in the game they got closer. shadow was sonics rival too. the game was highly concentrated on the hero dark rivalry.
tails and eggman got new toys as well. eggmans egg walker and tails's tornado folded up into a robot walker. there levels were played out as 3d shooter type games. like gammas levels in sa1. sonic and shadows levels were high speed action levels and rouge and knuckles had treasure hunting levels.
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