From Sega Retro
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- 1995 - The original planned release for the Sega Saturn in North America, before being rushed out the door several months early.
- 2013 - The 2013 remake of Castle of Illusion Starring Mickey Mouse is released for Xbox Live Arcade, PlayStation Network and Steam in North America and Europe.
- 1989 - Tectoy releases the Sega Master System in Brazil. The console would become one of the most popular systems in the country's history.
- 1999 - The Sega Dreamcast goes on sale in North America.
September 11 ():
- 1992 - Burai: Hachigyoku no Yuushi Densetsu is released for the Mega Drive in Japan.
- 1993 - NHL Hockey '94 is released for the Mega Drive in Europe.
- 1995 - Sega Channel launches in the Netherlands.
- 1997 - Assault Rigs, Chisato Moritaka: Watarasebashi/Lala Sunshine, Desire, Digital Pinball: Last Gladiators, Nobunaga no Yabou Tenshouki with Power-Up Kit, Silhouette Mirage and Sangokushi IV with Power-Up Kit are released for the Saturn in Japan.
- 1998 - Kyoto Joypolis opens.
- 2002 - Comix Zone is released for the Game Boy Advance in Europe.
- 2003 - Dorikore versions of Gaia Master Kessen! Seikiou Densetsu, The King of Fighters 2000, Miss Moonlight, Moero! Justice Gakuen and Pandora no Yume are released for the Dreamcast in Japan. Gekitou Pro Yakyuu: Mizushima Shinji Allstars vs Pro Yakyuu is released for the PlayStation 2 and GameCube in Japan.
- 2007 - The Mega Drive version of Chelnov is released for the Wii's Virtual Console in Japan.
- 2008 - Sega Ages 2500 Series Vol. 33: Fantasy Zone Complete Collection is released for the PlayStation 2 in Japan, alongside a soundtrack, Fantasy Zone Ultra Super Big Maximum Great Strong Complete Album. Phantasy Star Portable Perfect Bible is released in Japan.
- 2010 - Virtua Fighter 5 Final Showdown Masters Guide is released in Japan.
- 2015 - Hatsune Miku: Project Mirai DX is released for the Nintendo 3DS in Europe.
Anniversaries/September: Mortal Monday (
- 1993 - Home ports for Mortal Kombat arrive on a plethora of platforms, including the Sega Mega Drive, Sega Master System and Sega Game Gear in the West.
- 2002 - MiniMoni. Shakka to Tambourine! Dapyon!, the only original game published by Sega for the PlayStation is released in Japan.
- 2019 - The Mega Drive Mini is released worldwide.
September 27 (