The final confrontation against Dark Gaia is a multi-phase battle that will test everything you've learned. Be prepared for a long and epic fight.

- Phase 1: Perfect Dark Gaia (Sonic): Sonic must chase Perfect Dark Gaia, dodging its attacks and boosting into its weak points. Focus on maintaining speed and using Quick Step to avoid projectiles.
- Phase 2: Dark Gaia's Tentacles (Werehog): The Werehog must destroy Dark Gaia's tentacles. This involves climbing, dodging attacks, and unleashing powerful combos on the tentacle's eyes.
- Phase 3: Perfect Dark Gaia's Core (Sonic): Sonic returns to attack the core. This is a high-speed chase sequence, requiring precise boosting and Homing Attacks.
- Phase 4: Final Assault (Werehog & Chip): The Werehog, with Chip's help, delivers the final blows. This phase involves a combination of combat and quick-time events. Follow the on-screen prompts carefully.
Reward: Completion of the main story, unlocking Super Sonic for replayable stages, and a sense of immense satisfaction!