(It would feature just as heavily in Sonic Heroes, though less-so in Sonic '06.) Tails and Eggman pilot mechs and shoot their way through corridor levels, similar to E-102's levels in SA1. Sonic and Shadow are put into the usual platforming stages, now built around rail-grinding. The structure has also been altered from Sonic Adventure: instead of selecting a single character and guiding them through a Hub Level, the Action Stages are all sequential, with the player selecting 'Team Hero' or 'Team Dark' at the start. This game also introduced Shadow, Rouge, and the Exposition Fairy Omochao, each of whom would become mainstays. This is the first game in the series (barring Mascot Racers and Party Games) where you get to play as the villains, and by extension, the first where you play as Dr. For example, Sonic being mistaken for a black hedgehog with red stripes - and despite Sonic having already saved the world repeatedly. Got that? The plot is much murkier than previous games, with allusions to Gerald's insanity (the schematics on what turns out to be his old prison cell) and unlawful execution by the military, while still retaining the cheese the series is known for. Unfortunately for Knuckles, Rouge also has an interest in collecting the scattered emerald pieces. Joining him are his inventor friend 'Tails' Prower, who transforms his now-familiar plane into a Chicken Walker and Knuckles the Echidna, who is searching for the Master Emerald after it gets broken by Eggman. Breaking out of custody in 'the capital' (which looks an awful lot like Sonic Team's then-headquarters of San Francisco), Sonic resolves to find out what Shadow is up to. Sonic is mistaken for Shadow and falsely arrested. Eggman accidentally frees him during a raid on Gerald's island prison, and Shadow makes clear his intent to make humankind pay for Maria's death.

Joining Eggman in his scheme are two new accomplices: Rouge the Bat, a jewel thief with shady motives, and Shadow, a genetically-enhanced hedgehog who touts himself as Gerald's best achievement, and is able to teleport using Chaos Emeralds. Using the Chaos Emeralds to power the ARK's Wave-Motion Gun, Eggman can strong-arm the President into accepting his new world order. Professor Gerald Robotnik moved to the ARK so he could research a cure for his terminally-ill granddaughter Maria, but the project was mothballed by the military, causing Gerald to flip out and become incarcerated.

Ivo 'Eggman' Robotnik has hatched a new plot to conquer the world: reviving his grandfather's legacy, the now-abandoned Space Colony ARK. It is historic for three reasons: it's one of the Dreamcast's final releases, being released three months after the Dreamcast's official discontinuation, it came out on the franchise's 10th anniversary, and it wound up being the last Sonic game made before Sega quit making consoles and went third-party. Sonic Adventure 2 was the long-awaited sequel to Sonic Adventure.

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