From Sonic Retro
December 4 (
- 1992 — The build date of the v0.02 Sonic the Hedgehog CD prototype.
- 1993 — "Sonic Past Cool", the 13th episode of Sonic the Hedgehog, is the 12th episode to air in North America.
- 1996 — Issue #3 of the comic mini-series Sonic Quest: The Death Egg Saga is released in North America.
- 1997 — Sonic R is released for the Sega Saturn in Japan.
- 2003 — Sonic Battle is released for the Game Boy Advance alongside Tails no Flying Get for i-mode 504i and i-mode 505i compatible phones through Sega's Sonic Cafe portal in Japan.
- 2004 — "Showdown in Space", the 38th episode of Sonic X, airs in North America.
- 2013 — Sonic the Hedgehog is released on the Nintendo 3DS Virtual Console in Japan. Issue #255 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.