Anniversaries/December 9
From Sonic Retro
December 9 (add)
- 1995 — Issue #67 of Sonic the Comic is released in the United Kingdom.
- 1998 — Issue #21 of the comic series Knuckles the Echidna is released in North America.
- 2004 — Sonic Mega Collection Plus is released for the PlayStation 2 and Xbox alongside Sonic Heroes for Windows PCs in Japan.
- 2008 — Sonic Unleashed is released for the PlayStation 3 in Canada while Adventures of Sonic the Hedgehog Vol. 2, a DVD, is released in North America.