Sega officially announces Sonic Unleashed, generating excitement among fans for the new Sonic the Hedgehog installment.
Sonic Unleashed is released for PlayStation 2, PlayStation 3, Xbox 360, and Wii in North America, marking a major launch for the franchise.
Sonic Unleashed is released across Europe, making the game available to a wide audience.
Sonic Unleashed launches in its home market of Japan for all platforms.
The ancient evil, Dark Gaia, awakens after centuries of slumber, plunging the world into darkness and causing seismic upheavals.
Dark Gaia unleashes its power, shattering the planet into separate continents and intensifying chaos globally.
Dr. Eggman harnesses the chaos to revive his plans for world domination by using seismic devices linked to Dark Gaia.
Sonic attempts to stop Dark Gaia but is struck by its energy, transforming him into the Werehog at night.
Sonic embarks on a journey across various continents to retrieve the Chaos Emeralds and restore the planet.
Sonic experiences his first transformation into the Werehog, discovering new combat abilities and challenges.
Sonic meets Chip, who aids him in his quest, and gains insights into restoring the broken continents.
Sonic travels through different zones such as Apotos, Spagonia, and Chun-nan, gathering Chaos Emeralds and defeating Eggman's robots.
Sonic uses the power of the Chaos Emeralds to defeat Dark Gaia's manifested entity and restore the planet's integrity.
With Dark Gaia defeated, Sonic returns to his original form and the world is restored to its proper state.
