Sonic Boom: Shattered Crystal, also known as Sonic Toon: Island Adventure, is an action-adventure video game. Along with its Wii U sibling Sonic Boom: Rise of Lyric, Shattered Crystal is a spin-off of Sega's Sonic the Hedgehog franchise and is a part of the Sonic Boom sub-franchise, which consists also of an animated television series, whose games serve as its prequels. (wikipedia.org)