Well,there are 3 games with that name,so I'll answer it three ways.
Sonic the Hedgehog for the SEGA Genesis was released June 23rd,1991
Sonic the hedgehog for SEGA Game Gear was released December 1991
Sonic the hedgehog for Xbox 360 and PS3 was released November 14th,2006
1992.
Sadly no
sonic the hedgehog 2006
no he is not. he is only in sonic the hedghog 2006
Yuji Naka
no
omg YEAH!
no
June 23rd.
No he wasn't
Yes.
I would say Sonic the hedghog