From Sonic Retro
January 23 (
- 2002 — Issue #106 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.
- 2006 — Shadow Shoot is released for i-mode 505i compatible phones though Sega's Sonic Cafe portal in Japan.
- 2008 — True Blue: The Best of Sonic the Hedgehog, a compilation album, is released on CD in Japan.
- 2013 — Issue #48 of Sonic Universe and Sonic Universe Graphic Novel Series Volume 4: Journey to the East are released in North America.
- 2020 — Mario & Sonic at the Olympic Games Tokyo 2020 - Arcade Edition is released in Japanese arcades.