From Sonic Retro
December 15 (
- 1999 — Issue #171 of Sonic the Comic is released in the United Kingdom.
- 2003 — Sonic the Hedgehog: The Movie is released on DVD in the United Kingdom.
- 2005 — Shadow the Hedgehog is released for the PlayStation 2, Nintendo Gamecube, and Xbox in Japan.
- 2011 — Sonic the Hedgehog CD is released for iOS in North America and Europe.
- 2022 — Sonic Frontiers: The Music of Starfall Islands, a vinyl album, is released in the United Kingdom. Sonic Prime begins streaming through the Netflix streaming service worldwide.