Dark Sonic - The Hidden - Dark Sonic - The Hidden Form

Sonic Chronicles: Dark Brotherhood - Nintendo DS, Nintendo DS

Sonic the Hedgehog 2's Biggest Easter Egg and Other References - IGN

While not a fan-favorite, Sonic and The Black Knight has what I belive to be the most balanced and nuanced characterization of Sonic we've ever gotten. : r/SonicTheHedgehog

Is The Sonic Storybook Series Universe canon In Sonic Frontiers, or not Canon and it's self contained? : r/SonicTheHedgehog

Sonic Frontiers for Nintendo Switch - Nintendo Official Site

Sonic Origins Plus cheat codes: find Hidden Palace Zone and get Super Sonic - Video Games on Sports Illustrated

How does sonic turn into Dark sonic? - Quora

Sonic Frontiers review - new open zone direction still constrained by old flaws

How to unlock Sonic Superstars' true final boss - Video Games on Sports Illustrated