| 1960 |
- Nihon Goraku Bussan Co., Ltd. established
- SEGA 1000, Japan's first domestically-made jukebox, produced
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| 1964 |
- Merged with Nihon Kikai Seizo Co., Ltd.
- Commercial arcade machine production enterprise begins
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| 1965 |
- Merged with Rosen Enterprises, Ltd.
- Commercial arcade operations begin
- Name changed to SEGA Enterprises, Ltd.
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| 1966 |
- "Periscope" becomes a hit worldwide
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| 1969 |
- Becomes a subsidiary of American conglomerate, Gulf and Western Industries, Inc.
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| 1983 |
- 8-bit home video game console, "SG-1000", released
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| 1984 |
- SEGA becomes a subsidiary of the CSK Group after its Japanese assets are purchased
- SEGA Europe, Ltd. established to market commercial arcade machines to Europe
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| 1985 |
- SEGA Enterprises, Inc. (USA) established to market commercial arcade machines to America
- World's first motion simulator game, "Hang-On", released
- "UFO Catcher" claw machine released for commercial arcades
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| 1986 |
- SEGA of America, Inc. established to market consoles to America
- Listed as a major security
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| 1988 |
- Listed in the Second Section of the Tokyo Stock Exchange
- 16-bit home video game console, "Mega Drive (Sega Genesis)", released
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| 1990 |
- Listed in the First Section of the Tokyo Stock Exchange
- World's first 360-degree, spinning arcade machine, "R360", released
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| 1991 |
- "Sonic the Hedgehog" series first debuts
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| 1992 |
- 3D polygonal arcade game, "Virtua Racing", released
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| 1993 |
- World's first 3DCG fighting game, "Virtua Fighter", makes its debut
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| 1994 |
- 32-bit home video game console, "Sega Saturn", released
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| 1995 |
- SEGA/ATLUS' "Print Club (Purikura)®" makes its debut
- SEGA Logistics Service Co., Ltd. established to specialize in distribution
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| 1996 |
- "Tokyo Joypolis" opens near Tokyo
- "Sakura Taisen (Sakura Wars)" series first debuts on consoles
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| 1998 |
- "Dreamcast" home video game console released
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| 2000 |
- Name changed to SEGA Corporation
- First console-based online RPG, "Phantasy Star Online", released
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| 2002 |
- "Bee SHIBUYA" opens as the company's first darts bar
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| 2003 |
- First card game marketed towards children, "Mushiking: The King of Beetles", makes its debut
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| 2004 |
- SEGA and SAMMY join to establish SEGA SAMMY HOLDINGS INC.
- ALL.Net networking system established
- Arcade card game marketed towards girls, "Love and Berry: Dress Up and Dance!", makes its debut
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| 2005 |
- "Ryu Ga Gotoku (Yakuza)" series first debuts on consoles
- "Sangokushi Taisen (Three Kingdoms)" TCG first appears in arcades
- Purchase of American game developer, Creative Assembly
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| 2006 |
- Purchase of American game developer, Sports Interactive
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| 2007 |
- "Mario & Sonic at the Olympic Games™ (Beijing 2008)" debuts on consoles
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| 2009 |
- "Border Break" first appears in arcades
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| 2010 |
- "Kingdom Conquest" launched for iOS
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| 2012 |
- SEGA Networks Co., Ltd. established
- Online RPG, "Phantasy Star Online 2", launched
- "maimai" begins operating
- SEGA Entertainment, Inc. established
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| 2013 |
- "Puyopuyo!! Quest" launched for smart devices
- "Chain Chronicle" launched for smart devices
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| 2015 |
- EGA Corporation restructured into the SEGA Group
- Merge with SEGA Networks Co., Ltd.
- Console and digital services reestablished as SEGA Games
- Amusement machines division reestablished as SEGA Interactive
- Medieval fantasy RPG, "Hortensia Saga: Ao no Kishidan", launched
- "CHUNITHM" begins operating
- "goPlay" released as a global publishing support service for games on smart devices
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| 2016 |
- "KanColle Arcade" begins operating
- Original "Sonic the Hedgehog" game inducted into The Strong museum Hall of Fame in the US
- SEGA joins with Lancers, Inc. to establish digital marketing company, XD CO., LTD.
- Became the first Japanese console maker to sell directly in the Taiwanese market
- SEGA Interactive and Konami Digital Entertainment work to develop a multifaceted soft money system for arcades
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| 2017 |
- Localization section for Asian markets established
- Content distribution on Chinese video game platform, "WeGame", announced
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| 2018 |
- "Fate / Grand Order Arcade" begins operating
- "Puyopuyo" series approved for a Japan eSports Pro License
- All SEGA-SAMMY Group assets moved to the Osaki Garden Tower (Shinagawa-ku, Tokyo)
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| 2019 |
- Rieko Kodama receives the Pioneer Award at the 2019 Game Developers Choice Awards
- Full stock purchase of American game developer, Two Point Studios
- SEGA Group subsidiary becomes XD CO., LTD. following asset purchase from Dentsu, Inc.
- Creative Assembly, based in the US, reaches a publishing agreement with NetEase to release its real-time strategy game series, "Total War™", in mainland China
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| 2020 |
- SEGA Games and SEGA Interactive merged into the SEGA Corporation
- Online RPG, "Phantasy Star Online 2", released globally
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| 2021 |
- SEGA of America, Netflix and WildBrain work to produce, "SONIC PRIME", the new animated series based on "Sonic the Hedgehog"
- Merged with the SEGA Group
- Sega Sapporo Studio Co., Ltd. established
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| 2022 |
- "Sonic the Hedgehog 2" movie released
- "Sonic Frontiers" released globally
- SEGA Singapore Pte. Ltd. established
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| 2023 |
- Purchase of Finnish global mobile-first games company, Rovio Entertainment Corporation
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| 2024 |
- Foundation of SEGA FAVE CORPORATION thorugh a merger between SEGA's Amusement Machine business and SEGA TOYS CO., LTD.
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