From Sonic Retro
April 1: April Fools' Day (
- 1976 — Troy Baker, the English voice of Espio the Chameleon from 2010 to 2016, is born.
- 1994 — The build date of Sonic Crackers for the Sega Mega Drive, the earliest known prototype of what would become Chaotix.
- 1995 — Issue #49 of Sonic the Comic is released in the United Kingdom. The final Sonic the Hedgehog strip found in News of the World is published in the United Kingdom.
- 1998 — Issue #5 of the Sonic Super Special comic series is released in North America.
- 2006 — "The Cosmo Conspiracy", the 73rd episode of Sonic X, airs in North America.
- 2013 — Sonic the Hedgehog CD Lite is released for Android devices worldwide.
- 2015 — The Big Box version of Adventures of Sonic the Hedgehog Collector's Set, a DVD, is released in Australia.
- 2017 — "Mombot", the 73rd episode of Sonic Boom, airs in North America.
- 2020 — "Aisu Paresu no Tatakai", the 57th episode of Sonic X, airs in Japan.
- 2022 — The Sonic the Hedgehog 2 film premieres in theaters in the United Kingdom.
- 2023 — The Sonic the Hedgehog Speed Infuser, a device that allows its user to run as fast as Sonic, is released.