Anniversaries/December 28
From Sega Retro
December 28 (add)
- 1988 - Power Drift & Mega Drive, a Compact Cassette and CD, is released in Japan.
- 1991 - Sonic the Hedgehog and Space Harrier are released for the Sega Game Gear alongside Tenka Fubu: Eiyuutachi no Houkou for the Sega Mega-CD in Japan.
- 1993 - Sengoku Denshou is released for the Sega Mega-CD in Japan.
- 1996 - Battle Athletess Daiundoukai Perfect Guide Book, a book, is released in Japan.
- 1999 - Jimmy White's 2: Cueball is released for the Sega Dreamcast in Spain.
- 2000 - Cardcaptor Sakura: Tomoyo no Video Daisakusen, Sakura Taisen Dream Passport 3, and Sakura Taisen Kinematron Hanagumi Mail are released for the Sega Dreamcast in Japan. Dino Crisis is released for the Sega Dreamcast in Germany.
- 2004 - Sugorouku is released for i-mode 505i compatible phones through Sega's Sonic Cafe portal in Japan.
- 2006 - Sakura Taisen Kayou Show Final Kouen "Shin Ai Yueni" DVD Box, a DVD for the stage play of the same name, is released in Japan.
- 2007 - Phantasy Star Universe: Illuminus no Yabou Perfect Guide, a book, is released in Japan.
- 2009 - Senjou no Valkyria Anthology Comic, a book, is released in Japan.
- 2011 - 7th Dragon 2020 Complete Guide, a book, is released alongside Gunblade NY & L.A. Machineguns Original Soundtrack, a CD, in Japan.
- 2016 - Puyo Puyo Chronicle Kanpeki Kouryaku Guide, a book, is released in Japan.
- 2018 - Phantasy Star Online 2 Fashion Catalog 2017-2018 Legacy of Omega, a book, is released in Japan.