From Sonic Retro
September 30 (
- 1997 — Sonic 3D: Flickies' Island is released for PC in Europe.
- 2005 — Sonic Gems Collection is released for the Nintendo GameCube and PlayStation 2 in Europe.
- 2008 — Sonic Chronicles: The Dark Brotherhood is released for the Nintendo DS in North America.
- 2016 — Sonic Boom: Fire & Ice is released for the Nintendo 3DS in Europe.