Anniversaries/September 23
From Sonic Retro
September 23 (add)
- 1993 — Sonic the Hedgehog CD is released for the Sega Mega-CD in Japan.
- 1998 — Issue #65 of the Sonic the Hedgehog comic series by Archie Comics is released in North America. Issue #139 of Sonic the Comic is released in the United Kingdom.
- 2009 — Issue #8 of Sonic Universe is released in North America.
- 2015 — Issue #80 of Sonic Universe is released in North America.
- 2020 — Issue #32 of the Sonic the Hedgehog comic series by IDW Publishing is released in North America.