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Sonic Adventure is the first 3D platforming Sonic game, and the first Sonic game on the Dreamcast.
The gameplay is that, for Sonic, it's mostly based around speed and platforming, and controls much like how he did in the older games, Tails has similar gameplay to his older self, but can get upgrades among the way. Knuckles's gameplay is that he has to find pieces of the master emerald, that is spread out throughout the level. Amy's gameplay is that she can use her hammer to attack enemies and jump higher. And Big can fish.
- This is the first Sonic Game to use the modern Sonic designs (Sonic with green eyes for example)