Sega officially announces the development of Sonic Adventure for the Sega Dreamcast, marking a new chapter for the Sonic series with 3D gameplay.
Sonic Adventure is released in Japan as a launch title for the Sega Dreamcast, showcasing advanced graphics and gameplay mechanics.
Sonic Adventure launches in North America for the Dreamcast, expanding its reach to a global audience.
Sonic Adventure is released in Europe, completing its worldwide Dreamcast launch.
Sega announces a re-release of Sonic Adventure titled Sonic Adventure DX: Director's Cut for the Nintendo GameCube, featuring enhanced graphics and new content.
Sonic Adventure DX: Director's Cut is released for the Nintendo GameCube, bringing the classic title to a new generation of gamers.
The Chaos Emeralds are discovered on the mysterious Mystic Ruins island, setting the stage for the events to come.
Chaos, a water-like creature and guardian of the Chaos Emeralds, is awakened and begins reacting to the presence of the emeralds.
Dr. Robotnik arrives on the island to capture Chaos and harness its power for world domination.
Sonic, Tails, Knuckles, Amy, Big the Cat, and E-102 Gamma each start their individual journeys to stop Dr. Robotnik and investigate the chaos.
E-102 Gamma gains self-awareness and rebels against its creator, allying with the protagonists.
Knuckles embarks on a mission to protect the Master Emerald, unaware of Chaos’ influence spreading.
Sonic confronts Chaos, who has absorbed the power of all Chaos Emeralds and transformed into Perfect Chaos, to save the island and world.
