Sonic Unleashed is an action-adventure game developed for the Nintendo Wii by Dimps. The game follows Sonic the Hedgehog as he embarks on a quest to restore the world and himself after Dr. Eggman awakens an ancient evil, resulting in Sonic transforming into a Werehog at night. This version features distinct design choices and gameplay mechanics compared to the enhanced versions on other platforms.
Sonic the Hedgehog struggles to undo the damage done to the world and himself after Dr. Eggman unleashes an ancient evil which causes him to transform into a vicious Werehog by night.
The version of Sonic Unleashed developed by Dimps for the Wii and PlayStation 2 differs somewhat in design and and mechanics from the one made by Sonic Team for other platforms, including a different engine and fewer high-speed daytime levels.