From Sonic Retro
April 4 (
- 1994 — Sonic the Hedgehog 3: Official Super-Sonic Tips for SegaManiacs!, a strategy guide, is published in North America.
- 2001 — Issue #204 of Sonic the Comic is released in the United Kingdom.
- 2007 — Issue #18 of the Sonic X comic series is released in North America.
- 2012 — Issue #235 of the Sonic the Hedgehog comic series by Archie Comics is released in North America.
- 2015 — "Hedgehog Day", the 20th episode of Sonic Boom, airs in North America.
- 2018 — IDW Publishing begins publishing Sonic the Hedgehog in North America.