Anniversaries/January 1
From Sonic Retro
January 1: New Year's Day (add)
- 2018 — Sonic Adventure Official Soundtrack Vinyl Edition and Sonic Adventure 2 Official Soundtrack Vinyl Edition, two vinyl albums, are released in Europe.
- 2021 — drx and Buckaroo release a prototype of the original Sonic the Hedgehog for the Sega Mega Drive. This prototype was sought after for over 20 years.