

Sonic Adventure retains many elements from prior Sonic games, such as power-ups and the ring-based health system. Controlling one of the six characters-each with their own special abilities-players explore a series of themed levels to progress through the story. The story follows Sonic the Hedgehog, Miles "Tails" Prower, Knuckles the Echidna, Amy Rose, Big the Cat, and E-102 Gamma in their quests to collect the seven Chaos Emeralds and stop series antagonist Doctor Robotnik from unleashing Chaos, an ancient evil.

Sonic Adventure is a 1998 platform game for Sega's Dreamcast, and the first main Sonic the Hedgehog game to feature three-dimensional (3D) gameplay.
