Is there a secret Sonic?

Excuse me, could you elaborate on what you mean by "Is there a secret Sonic?" Are you referring to a hidden version of the popular video game franchise Sonic the Hedgehog? Or perhaps you're inquiring about a secret character, level, or feature within one of the Sonic games? It would be helpful if you could provide more context or clarify your question, as the term "secret Sonic" could have multiple interpretations. Could you please elaborate on your inquiry?