From Sonic Retro
June 18 (
- 1993 — The Official Sega Solid Gold Guide: Sonic the Hedgehog 2 is published in the United Kingdom.
- 1994 — Issue #5 of Sonic the Poster Mag and Sonic the Summer Special, a comic, are released in the United Kingdom.
- 2001 — Sonic the Hedgehog and Sonic Watch are released for i-mode 503i compatible phones through Sega's Sonic Cafe portal in Japan.
- 2004 — Sonic Advance 3 is released for the Game Boy Advance in Europe.