Board Thread:General Discussion/@comment-26244866-20150531224124/@comment-26973802-20150622002520

Zazz is in it, though in what role I don't know

See? Even if they're dead in main canon (which they aren't in the 3DS version, and Sonic Runners appears to be in continuity with the handheld versions of Colors, Generations, and Lost World instead of Wii/XBox/Wii U) they can still appear in spinoffs like these. In London 2012 Metal Sonic is playable and Eggman Nega is a rival