Sonic Boom: Shattered Crystal, known as Sonic Toon: Island Adventure (ソニックトゥーン アイランドアドベンチャー Sonikku Tūn: Airando Adobenchā?) in Japan, is a 2014 action-adventure video game published by Sega, developed by Sanzaru Games for the Nintendo 3DS. 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 new Sonic Boom franchise, which consists also of an animated television series, whose games serve as its prequels, and other media. The two games together formed the third and final part in Sega's exclusivity agreement with Nintendo, following Sonic Lost World and Mario & Sonic at the Sochi 2014 Olympic Winter Games in 2013. Both games were released on November 11, 2014 in North America, on November 21 in Europe, and Japan on December 18, 2014. A sequel, Sonic Boom: Fire & Ice, is currently in development for release in 2016.

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