Anniversaries/December 18
From Sega Retro
December 18 (add)
- 1987 - Thunder Blade is released in Japanese Arcades for the Sega X Board board.
- 1990 - Dangerous Seed is released for the Sega Mega Drive in Japan.
- 1992 - Pachinko Kuunyan, Puyo Puyo, R.B.I. Baseball 4, and I Love Mickey and Donald: Fushigi na Magic Box are released for the Sega Mega Drive alongside Kuni Chan no Game Tengoku Part 2 for the Sega Game Gear, and After Burner III, Gambler Jiko Chuushinha 2: Gekitou! Tokyo Mahjong Land Hen, and Road Blaster FX for the Sega Mega-CD in Japan. Jerry Glanville's Pigskin Footbrawl is released for the Sega Mega Drive in North America. Ex-Mutants is released for the Sega Mega Drive in Europe.
- 1996 - Geki! Teikoku Kagekidan and Sakura Taisen Teigeki Kayou Zenshuu, both CDs, are released in Japan.
- 1997 - Vol. 1 of Sakura Taisen: Ouka Kenran, a VHS and LaserDisc, is released alongside Crows: The Battle Action for SegaSaturn, DJ Wars, Grandia, Junclassic C.C. & Rope Club, Kyuukyoku Tiger II Plus, Ninpen Manmaru, OoEdo Renaissance, Private Idol Disc Vol. 11: Hirose Mayumi, R?MJ The Mystery Hospital, Suikoden Tendou 108 Sei, Texthoth Ludo: Arcanum Senki, Twinkle Star Sprites, Ultraman Zukan 2, Universal Nuts, and Zap! Snowboarding Trix '98 for the Sega Saturn in Japan. FIFA Road to World Cup 98, NBA Live 98, and Steep Slope Sliders are released for the Sega Saturn in North America.
- 1998 - Sakura Taisen Kayou Show Teikoku Kagekidan Dai 2-kai Hanagumi Tokubetsu Kouen "Tsubasa": Sound Album, a CD for the stage play Sakura Taisen Kayou Show Teikoku Kagekidan Dai 2-kai Hanagumi Tokubetsu Kouen "Tsubasa", is released alongside Sakura Taisen: Ouka Kenran, a DVD, in Japan.
- 1999 - Sakura Taisen: Gouka Kenran Chapter 1, a VHS, LaserDisc, and DVD, is released in Japan. Seventh Cross Evolution is released for the Sega Dreamcast in North America.
- 2000 - Evil Dead: Hail to the King is released for the Sega Dreamcast in North America. Chicken Run is released for the Sega Dreamcast in Australia.
- 2002 - Sakura Taisen: Kanzaki Sumire Intai Kinen Su-mi-re, a VHS and DVD, is released alongside Hitori de Puyo Puyo for J-Sky (50KB) compatible phones through Sega's Sega Ages portal and Puyo Puyo for EZweb (Java Phase 2/2.5) compatible phones through Sega's Sega Ages portal in Japan.
- 2003 - Sega Ages 2500 Series Vol. 7: Columns is released for the PlayStation 2 alongside Astro Boy: Tetsuwan Atom: Atom Heart no Himitsu for the Game Boy Advance, and Sonic Adventure DX: Director's Cut for Windows PCs in Japan. World Club Champion Football 2016-2017 is released in North American Arcades for the Sega Chihiro board.
- 2006 - Space Harrier II is released for the Wii Virtual Console in North America.
- 2007 - NiGHTS: Hoshi Furu Yoru no Monogatari Dream Flight Guide, a book, is released alongside Party Quiz Mega Q for the Wii Virtual Console in Japan. Sonic Underground: The Greatest Hits, a CD, is released alongside Vol. 1 of Sonic Underground, a DVD, NiGHTS: Journey of Dreams for the Wii, and Sonic the Hedgehog for the iPod in North America.
- 2008 - Bleach: Versus Crusade, Let's Tap, and Sonic World Adventure are released for the Wii alongside Virtua Racing for EZweb (BREW 4.0) compatible phones through Sega's Puyo Puyo! Sega portal in Japan.
- 2012 - Hanafuda Asobi: Koi Koi Shimasho is released for Android devices through Sega's Puyo Puyo! Sega portal in Japan. Sonic & All-Stars Racing Transformed is made available for digital download on the PlayStation Store in North America and released for the PlayStation Vita in Europe. Ryuu ga Gotoku 1&2 HD Edition is made available for digital download on the PlayStation Store in South Korea while it is released for the PlayStation 3 in Taiwan alongside Fighting Vipers and Sonic the Fighters for the PlayStation 3 in South Korea and Taiwan.
- 2013 - Hatsune Miku: Project DIVA Arcade Original Song Collection Vol. 3, a CD, is released alongside 3D After Burner II for the Nintendo 3DS in Japan.
- 2014 - Sonic Toon: Taiko no Hihou is released for the Wii U alongside Sega 3D Fukkoku Archives and Sonic Toon: Island Adventure for the Nintendo 3DS in Japan. Shogun 2: Fall of the Samurai is released for Linux devices through Steam and the Mac App Store in North America and Europe.
- 2015 - The World End Eclipse is released for Windows PCs in Japan.
- 2017 - Sega Catcher Online is released for iOS in Japan.
- 2018 - Persona 3: Dancing in Moonlight, Persona 5: Dancing in Starlight, and P3D & P5D Bundle + Megaverse Costume Pack are released for the PlayStation Vita in North America.
- 2019 - Space Channel 5 20th Anniversary "GyunGyun Selection", a physical CD, is released and made available to download and stream for Amazon, iTunes, and the Mora streaming platform in Japan and made available to download and stream for Amazon and iTunes in North America and Europe.