1991.
Sonic Mandala was created in 1997.
Sonic the Hedgehog - character - was created in 1991.
Naoto Ōshima created Sonic the Hedgehog 2 and the game was created in 1992
sonic exe is an evil version of sonic that's NOT created by SEGA.
No! Shadow was created by Eggman not Sonic.
Sonic Me was created in 2005.
Sonic Mandala was created in 1997.
Sonic Eraser was created in 1991.
Sonic Blast was created in 1997.
Sonic Surgery was created in 2002.
Sonic Belligeranza was created in 2000.
Sonic Death was created in 1984.
Sonic Focus was created in 1995.
Sonic Orb was created in 1995.
Wizards of the Sonic was created in 1994.
Sonic Impact was created in 1999.
Sonic Youth was created in 1981.