After dexlabs freed sonic, they accidentally sent him to yoshi's island. Fuse was going to conquer it soon, so sonic saved the yoshi's of ysohi's island. After that, sonic got over six chaos emeralds, and battled fusion yoshi for the final one. After this, dexlabs returned sonic and the yoshi's back to dexlabs. After this, sonic can be found in mystic ruins. He gives out a few missions. It appeared before the war that fuse destroyed the chaos emeralds, but he did this to delay the hope and the search for the heroes.