Anniversaries/October 31
From Sonic Retro
October 31: Halloween (add)
- 2001 — Issue #103 of the Sonic the Hedgehog comic series by Archie Comics is released in North America. Issue #219 of Sonic the Comic is released in the United Kingdom.
- 2003 — Sonic Pinball Party is released for the Game Boy Advance in Europe.
- 2012 — Sonic the Hedgehog 2 is released on the Nintendo 3DS Virtual Console in Japan. Issue #242 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.
- 2013 — The stand-alone comic Sonic Lost World Halloween Comic Fest is released in North America.
- 2015 — "Cabin Fever", the 50th episode of Sonic Boom, airs in North America.
- 2018 — Issue #10 of the Sonic the Hedgehog comic series by IDW Publishing is released in North America.