Anniversaries/May 23
From Sega Retro
May 23 (add)
- 1997 - Advanced World War: Sennen Teikoku no Koubou Official Guide, a book, is released alongside Blam! Machinehead, Cube Battler: Anna Mirai-hen, Ryuuteki Gosennen: Dragons of China, and Wara² Wars: Gekitou! Daigundan Battle for the Sega Saturn in Japan. Krazy Ivan is released for the Sega Saturn in Europe.
- 1998 - Chou Kouryakubon Game no Arukikata Books DX: Super Robot Taisen F Kanketsuhen, a book, is released in Japan.
- 1999 - Dungeons & Dragons Collection, a book, is released in Japan.
- 2000 - Tony Hawk's Pro Skater is released for the Sega Dreamcast in North America.
- 2001 - Eternal Arcadia Drama CD Vol. 3, a Drama CD, is released in Japan. Exhibition of Speed is released for the Sega Dreamcast in Spain.
- 2002 - NBA 2K2 is released for the Sega Dreamcast and PlayStation 2 in Japan. Cannon Spike and Heavy Metal Geomatrix are released for the Sega Dreamcast in Europe.
- 2003 - Amigo-kun no Doki Doki Aishou Check, Jigsaw Puzzle, Pipe Line, Puyo Puyo DX, and Pyramid Magic are released for i-mode 505i compatible phones through Sega's Sonic Cafe portal in Japan. Skies of Arcadia Legends is released for the Nintendo Gamecube alongside Phantasy Star Online Episode I & II for the Xbox and The Revenge of Shinobi for the Game Boy Advance in Europe.
- 2006 - Wild River, a Mid-size attraction, opens in Chinese Arcades.
- 2008 - Condemned 2 is released for the PlayStation 3 in South Korea.
- 2012 - Sonic Riders Original Soundtrack "Speedbeats Grand Prix" and Sonic Riders Shooting Star Story Original Soundtrack "Zero Gravity Tracks" are released for the Mora streaming platform in Japan. Sega Vintage Collection: Alex Kidd & Co. and Sega Vintage Collection: Monster World are released for the Xbox 360 in Japan, North America, Europe, and Australia alongside Alex Kidd in Miracle World, Super Hang-On, The Revenge of Shinobi, Wonder Boy in Monster Land, Wonder Boy in Monster World, and Monster World IV for the PlayStation 3 in Japan, Europe, and Australia.
- 2013 - Sega Card-Gen MLB 2013 is released in Japanese Arcades for the Sega RingEdge board.
- 2017 - Shogun 2: Total War and Shogun 2: Fall of the Samurai are released for Linux devices through Steam in North America and Europe.
- 2018 - UFO Catcher Triple Twin, a prize game, is released in Japanese Arcades.
- 2019 - Wonder Boy: The Dragon's Trap is released for iOS, Apple TV, and the Mac App Store alongside Finding Teddy, an aftermarket Sega Dreamcast game, in North America. Total War: Three Kingdoms is released on Steam, and for Mac OS X and Linux devices through Steam in North America, Europe, and Australia alongside a physical version for Windows PCs in Europe.