|Industry||Video game industry|
|Products||List of Sonic Team games|
Sega CS Research and Development No. 2,[a] commonly abbreviated as Sega CS2 R&D and better known as Sonic Team,[b] is a video game development division of the Japanese company Sega. Sonic Team is best known for the long-running Sonic the Hedgehog series and games such as Nights into Dreams and Phantasy Star Online.
The initial team, formed in 1990, was composed of staff from Sega's Consumer Development division, including programmer Yuji Naka, artist Naoto Ohshima, and level designer Hirokazu Yasuhara. The team took the name Sonic Team in 1991 with the release of Sonic the Hedgehog for the Sega Genesis. The game was a major success that contributed to millions of Genesis sales. The next Sonic games were developed by Naka and Yasuhara in America at Sega Technical Institute, while Ohshima worked on Sonic CD in Japan. Naka returned to Japan in late 1994 to become the head of CS3, later renamed R&D No. 8. During this time, the division took on the Sonic Team brand but developed games that do not feature Sonic, such as Nights into Dreams (1996) and Burning Rangers (1998).
Following the release of Sonic Adventure in 1998, some Sonic Team staff moved to the United States to form Sonic Team USA and develop Sonic Adventure 2 (2001). With Sega's divestiture of its studios into separate companies, R&D No. 8 became SONICTEAM Ltd. in 2000, with Naka as CEO and Sonic Team USA as its subsidiary. Sega's financial troubles led to several major structural changes in the early 2000s; the United Game Artists studio was absorbed by Sonic Team in 2003, and Sonic Team USA became Sega Studios USA in 2004. After Sammy Corporation purchased Sega in 2004, Sonic Team was reincorporated to become Sega's GE1 research and development department, later renamed CS2.
Naka departed Sonic Team during the development of Sonic the Hedgehog (2006), and Sega Studios USA was merged back into Sonic Team in 2008. The following decade was marked by Sonic titles of varying reception, with department head Takashi Iizuka acknowledging that Sonic Team had prioritized shipping over quality.
1990: Formation and Sonic the Hedgehog
In 1983, programmer Yuji Naka was hired into Sega's Consumer Development division. His first project was Girl's Garden, which he and Hiroshi Kawaguchi created as part of their training process. For his next game, Phantasy Star (1987) for the Master System, Naka created pseudo-3D animation effects. He met artist Naoto Ohshima while working on the game.
During the late 1980s and early 1990s, a rivalry formed between Sega and Nintendo due to the release of their 16-bit video game consoles: the Sega Genesis and the Super Nintendo Entertainment System. Sega needed a mascot character that would be as synonymous with their brand as Mario was to Nintendo. To distinguish themselves from Nintendo, Sega wanted a killer app and character that could appeal to an older demographic than preteens, demonstrate the capabilities of the Genesis, and ensure commercial success in North America.
Some sources indicate Sega of Japan held an internal competition to submit characters designs for a mascot, while designer Hirokazu Yasuhara said the direction was given only to himself, Ohshima, and Naka. Ohshima designed a blue hedgehog named Sonic, who was inserted into a prototype game created by Naka. The Sonic design was refined to be less aggressive and appeal to a wider audience before the division began development on their platform game Sonic the Hedgehog. According to Ohshima, Sega was looking for a game that would sell well in the United States as well as in Japan. Ohshima and Naka already had the game and character ready, with Ohshima having worked with Sega's toy and stationery department on design ideas. Ohshima claims that the progress they had already made encouraged the company to select their proposal, as theirs was the only team to have put in a high amount of time and effort. This left him confident their proposal would be selected.
The Sonic the Hedgehog project began with just Naka and Ohshima, but grew to involve two programmers, two sound engineers, and three designers. Yasuhara joined to supervise Naka and Ohshima and develop levels, and became the lead designer. He satisfied Naka's request for a simple, one-button design by having Sonic do damage by jumping. Sonic the Hedgehog was released in 1991 and proved a major success, contributing to millions of sales of the Genesis. The development team took the name Sonic Team for the game's release. Naka has referred to Sonic Team as only a "team name" at this point.
1994–1998: Re-establishment and new intellectual properties
Shortly after the release of Sonic the Hedgehog, Naka, Yasuhara, and a number of other Japanese developers relocated to California to join Sega Technical Institute (STI), a development division established by Mark Cerny intended as an elite studio combining the design philosophies of American and Japanese developers. While Naka and Yasuhara developed Sonic the Hedgehog 2 with STI, Ohshima worked on Sonic CD, a sequel for the Sega CD add-on. Though Naka was not directly involved in the Sonic CD development, he exchanged design ideas with Ohshima.
Following the release of Sonic & Knuckles in 1994, Yasuhara quit, citing differences with Naka. Naka returned to Japan, having been offered a role as a producer. He was placed in charge of Sega's Consumer Development Department 3, also known as CS3. Naka was reunited with Ohshima and brought with him Takashi Iizuka, who had also worked with Naka's team at STI. In the mid-1990s, Sonic Team started work on new intellectual property, leading to the creation of Nights into Dreams (1996) and Burning Rangers (1998) for the Sega Saturn. Naka stated that the release of Nights is when Sonic Team was truly formed as a brand.
The Saturn did not achieve the commercial success of the Genesis, so Sega focused its efforts on a new console, the Dreamcast, which debuted in Japan in 1998. The Dreamcast was seen as opportunity for Sonic Team to revisit the Sonic series, which had stalled in recent years. Sonic Team was originally creating a fully 3D Sonic game for the Saturn, but development moved to the Dreamcast to align with Sega's plans. Takashi Iizuka led the project; Iizuka had long wanted to create a Sonic role-playing video game and felt the Dreamcast was powerful enough to achieve his vision. The game became Sonic Adventure, launched in 1998, which became the bestselling Dreamcast game.
Around this time, CS3 was renamed to Sega Research and Development Department 8 (R&D #8). While sometimes referred to as AM8 or "Sega-AM8", based on the R&D structure being titled the Sega Amusement Machine Research and Development (AM) teams, Sonic Team focused solely on home console games. Until 2000, media referred to Sonic Team's designation as both R&D #8 and AM8.
1999–2003: Dreamcast and Sega restructuring
In 1999, shortly after the release of Sonic Adventure, twelve Sonic Team members relocated to San Francisco to establish Sonic Team USA, while others remained in Japan. Shortly afterward, a number of key employees—including Ohshima—left Sega to form a new studio, Artoon. Sonic Team achieved success in the arcade game market in 1999 with the launch of rhythm game Samba de Amigo, released the following year for the Dreamcast. The studio also began developing online games; in 1999, they released ChuChu Rocket!, a puzzle game that made use of the Dreamcast's online capabilities. In 2000, Sonic Team launched the role-playing game Phantasy Star Online to critical and commercial success.
Sega began to restructure its studios as part of the dissolution of Sega Enterprises and spun off its software divisions into subsidiary companies. When the departments took new names, Naka felt it important to preserve the Sonic Team brand name, and the division's new legal name as a company was SONICTEAM, Ltd. Naka was installed as the CEO, and Sonic Team USA became a subsidiary of the new company.
Despite a number of well-received games, Sega discontinued the Dreamcast in 2001 and exited the hardware business. Sega transitioned into a third-party developer and began developing games for multiple platforms. From 2000, Sonic Team in Japan began to release fewer games, with a few releases such as the puzzle game Puyo Pop and the action game Billy Hatcher and the Giant Egg. The company changes and lack of a Sega console affected Sonic Team; according to Naka, in a 2006 interview, "Our approach was always to create strategic title concepts, which included the hardware. We do somewhat miss the idea of being able to address these constant challenges."
Early in 2003, Sega president Hideki Sato and COO Tetsu Kamaya announced they were stepping down from their roles, with Sato being replaced by Hisao Oguchi, the head of Hitmaker. As part of Oguchi's restructuring plan, he announced his intention to consolidate Sega's studios into "four or five core operations." Sonic Team was financially solvent and absorbed United Game Artists, another Sega subsidiary led by Tetsuya Mizuguchi and known for the music games Space Channel 5 (1999) and Rez (2001).
2004–present: Reintegration and recent years
In 2004, Japanese company Sammy acquired a controlling interest in Sega and formed Sega Sammy Corporation. Prior to the merger, Sega began the process of re-integrating its subsidiaries into the main company. Sonic Team USA became Sega Studios USA, while SONICTEAM Ltd. became Sega's Global Entertainment 1 research and development division (GE1). The team is still referred to as Sonic Team. Naka announced his departure on 8 May 2006 and formed a new studio, Prope, to focus on creating original games. In a 2012 interview, Naka stated that a reason that he left the company was that he would have been required to continue making Sonic games, and he no longer wished to do that. He left Sonic Team during the development of the 2006 game Sonic the Hedgehog (2006), released as part of the 15-year anniversary of the Sonic franchise. Noted for its bugs and design flaws, Sonic the Hedgehog was panned, as was Sonic Unleashed (2008). Both games were released for the PlayStation 3 and Xbox 360; Sonic Team also developed a series of Sonic games for the Wii and Nintendo DS, such as 2007's Sonic and the Secret Rings.
By 2010, Sonic Team became CS Research and Development No. 2 (CS2), Sega Studios USA was reintegrated into the Japanese team, and Iizuka was installed as the head of the department. After a series of poorly received Sonic releases, Sonic Team refocused on speed and more traditional side-scrolling in Sonic the Hedgehog 4: Episode I and II, Sonic Generations, and Sonic Colors, which all received better reviews. In 2015, Iizuka recognized in an interview with Polygon that Sonic Team had prioritized shipping games over quality, and had not had enough involvement in later third-party Sonic games, such as Sonic Boom: Rise of Lyric. He hoped the Sonic Team logo would stand as a "mark of quality"; he planned to release quality games and expand the Sonic brand, while retaining the modern Sonic design. In another interview, Iizuka stated that Sonic Team was not involved in the Sonic Boom and that they were developed by "Sega of America from back in the day". Sonic Team's first Sonic game exclusive to smartphones, Sonic Runners, was released in 2015. An endless runner, it was designed to have more replay value than other games in the genre. Sonic Runners received mixed reviews and was unprofitable, resulting in its discontinuation a year later.
In 2017, Sonic Team developed and released Sonic Forces, and oversaw the development of Sonic Mania by Christian Whitehead. Forces was aimed at a broad audience of young and adult players, while Mania was focused on fans of the original Genesis games. Mania became the best reviewed Sonic game in fifteen years following years of mixed reviews for the franchise. In 2018, Sega announced Sonic Team was working on the sixth main installment in the Sakura Wars series, tentatively titled Project Sakura Wars; it is scheduled for release in 2019 in Japan and 2020 internationally. At SXSW in March 2019, Iizuka confirmed Sonic Team was also working on a new Sonic title.
Sega Studios USA
|Sonic Team USA|
|Industry||Video game industry|
San Francisco, California,
Sega Studios USA, formerly Sonic Team USA, was a division of Sega and of Sonic Team while Sonic Team was a subsidiary company. It was founded when twelve Sonic Team members, including Takashi Iizuka, relocated to San Francisco, California, in 1999, and were set as a subsidiary of SONICTEAM Ltd. by 2000. The team worked on game development, translation, and market studies in the United States, until they returned to Japan and merged back into Sonic Team in 2008.
Sonic Team USA translated Sonic Adventure and tested ChuChu Rocket! in America before beginning work on Sonic Adventure 2. They took inspiration from their location in San Francisco, as well as Yosemite National Park and other areas of the United States. Sonic Adventure 2 was released on 20 June 2001, and was ported to the GameCube. The next Sonic Team USA project was Sonic Heroes (2003), the first Sonic game developed for multiple platforms. Sonic Team USA took a different approach with Heroes from the Sonic Adventure games, focusing on gameplay more similar to the Genesis games to which even casual gamers could adapt.
After SONICTEAM Ltd. merged back into Sega in 2004, Sonic Team USA was renamed Sega Studios USA. The division's next project was Shadow the Hedgehog, released in 2005, a spin-off starring Shadow. Unlike previous games, Shadow the Hedgehog was targeted at older players and featured different gameplay styles, including the use of guns and different endings to the game. Shadow the Hedgehog was critically panned for its mature themes and level design, but was a commercial success, selling at least 1.59 million units.
The final Sega Studios USA game was Nights: Journey of Dreams, the sequel to Nights into Dreams and the first Nights game since the cancellation of Air Nights in 2000. Iizuka felt it was important to retain the original game's concepts while developing new mechanics, and released it on the Wii, a more family-oriented console. Journey of Dreams was also designed to have a more European feel, in contrast to the Sonic games, which were more American. The sound and CGI were completed by Sonic Team in Japan, while Sega Studios USA handled the rest of the development for the 2007 release.
Sega Studios USA oversaw the development of Sonic Rivals (2006) and Sonic Rivals 2 (2007) by Backbone Entertainment. In 2008, Sega Studios USA merged with Sonic Team, making Iizuka the head of Sonic Team and a vice president of product development for Sega. In 2016, Iizuka relocated to Los Angeles to oversee development with the goal of making Sega's studios in Los Angeles "a centralized hub for the global brand".
Sonic Team has developed a number of video games, with many of them becoming bestsellers. The studio is best known for its Sonic the Hedgehog series of platform games, which account for the majority of Sonic Team's work; the 1991 release of Sonic the Hedgehog is considered one of the most important moments in video game history, as it propelled Genesis sales and displaced Nintendo as the leading video game company. Sonic Team have also developed a wide variety of other games, including action games such as Nights into Dreams, Burning Rangers, and Billy Hatcher and the Giant Egg, the online puzzle game ChuChu Rocket!, the online role-playing game Phantasy Star Online, and the music game Samba de Amigo. Phantasy Star Online is credited for introducing online RPGs to consoles and was the first online RPG for many players. According to Sean Smith of Retro Gamer, few companies could claim to have released as many AAA games over such a long period, especially between 1991 and 2000. Some Sonic Team games, such as the original Sonic games for the Genesis and Nights, are considered some of the best video games ever made. As of 2019, Sonic Team is working on Project Sakura Wars and a new Sonic game. Iizuka has said Sonic Team would be open to developing a third Nights game or a sequel to Knuckles' Chaotix (1995), if Sega were to commission them.
Sega and Sonic Team have been criticized for their handling of Sonic the Hedgehog after the beginning of the 3D era of video games. Edwin Evans-Thirlwell of Eurogamer described the 3D Sonic games as "20-odd years of slowly accumulating bullshit", and that unlike Sonic's main competitor, Nintendo's Mario series, Sonic in 3D never had a "transcendental hit". Zolani Stewart of Kotaku argued that Sonic's portrayal starting with Sonic Adventure with the addition of voice acting and a greater focus on plot and character narrative changed Sonic into "a flat, lifeless husk of a character, who spits out slogans and generally has only one personality mode, the radical attitude dude, the sad recycled image of vague '90s cultural concept." Sega of America marketing director Al Nilsen and Sonic Mania developer Christian Whitehead said they felt the number of additional characters added to the series was problematic, with Whitehead describing the characters as "padding". In 2015, Sega CEO Haruki Satomi acknowledged that Sega had "partially betrayed" the trust of the longtime fans of their games and hoped to focus on quality over quantity.
- "Sega's new beginning". Edge. No. 89. Future plc. October 2000. pp. 68–78. ISSN 1350-1593.
- "The Making of OutRun". NowGamer. Imagine Publishing. 29 April 2016. Archived from the original on 20 April 2016. Retrieved 8 April 2016.
- Horowitz, Ken (6 December 2017). "Behind the Design: Phantasy Star". Sega-16. Ken Horowitz. Archived from the original on 22 March 2018. Retrieved 21 March 2018.
- Horowitz, Ken (5 January 2012). "Sega Stars: Naoto Ōshima". Sega-16. Ken Horowitz. Archived from the original on 17 June 2018. Retrieved 17 June 2018.
- Smith, Sean (2006). "Company Profile: Sonic Team". Retro Gamer. No. 26. Imagine Publishing. pp. 24–29. ISSN 1742-3155.
- Thorpe, Nick (2016). "The Story of Sonic the Hedgehog". Retro Gamer. No. 158. Imagine Publishing. pp. 18–25. ISSN 1742-3155.
- Kelion, Leo (13 May 2014). "Sega v Nintendo: Sonic, Mario and the 1990's console war". BBC News. BBC. Archived from the original on 15 October 2016. Retrieved 19 November 2016.
- Hester, Blake. "Sonic the Hedgehog's long, great, rocky history". Polygon. Vox Media. Archived from the original on 1 December 2016. Retrieved 19 November 2016.
- Thomas, Lucas M. (26 January 2007). "Sonic the Hedgehog VC Review". IGN. Ziff Davis. Archived from the original on 13 January 2016. Retrieved 23 February 2014.
- "Game Design Psychology: The Full Hirokazu Yasuhara Interview". Gamasutra. UBM Tech, Ltd. Archived from the original on 9 July 2018. Retrieved 9 July 2018.
- Naoto Ohshima (2013). Les Editions Pix'n Love (ed.). "Interview With Naoto Ôshima". The History Of Sonic The Hedgehog (Interview). UDON Entertainment Corp. pp. 96–101. ISBN 978-1-926778-96-9.
- Yuji Naka (2013). Les Editions Pix'n Love (ed.). "Interview With Yuji Naka". The History Of Sonic The Hedgehog (Interview). UDON Entertainment Corp. pp. 90–95. ISBN 978-1-926778-96-9.
- Les Editions Pix'n Love, ed. (2013). "Zone 1 Genesis". The History Of Sonic the Hedgehog. Ontario: UDON Entertainment Corp. pp. 20–33. ISBN 978-1-926778-96-9.
- Day, Ashley (2007). "Company Profile: Sega Technical Institute". Retro Gamer. No. 36. Imagine Publishing. pp. 28–33. ISSN 1742-3155.
- Sheffield, Brandon (4 December 2009). "Out of the Blue: Naoto Ohshima Speaks". Gamasutra. UBM TechWeb. Archived from the original on 24 April 2016. Retrieved 15 April 2017.
- "Topics: The 1998". Sega Saturn Magazine (in Japanese). Soft Bank Publishing. 23 January 1998. pp. 18–29.
- Hunt, Stuart; Jones, Darran (December 2007). "The Making of... Nights". Retro Gamer. No. 45. Imagine Publishing.
- Shea, Brian (1 October 2016). "Jumping Platforms: How Sonic Made The Leap To Nintendo". Game Informer. GameStop. Archived from the original on 6 November 2016. Retrieved 21 November 2016.
- "Sega development divisions". Dreamcast Magazine (in Japanese). Soft Bank Publishing. 19 November 1999. p. 13.
- Robinson, Martin (6 July 2017). "Maybe it's time for us to leave Sonic Team's take on its own series behind". Eurogamer. Gamer Network, Ltd. Archived from the original on 3 January 2018. Retrieved 9 July 2018.
- Horowitz, Ken (2018). The Sega Arcade Revolution: A History in 62 Games. Jefferson, North Carolina: McFarland & Company. p. 170. ISBN 9781476631967.
- EGM Staff (October 2000). "Sega's R&D Hierarchy". Electronic Gaming Monthly. No. 153. Sendai Publishing. p. 40. ISSN 1058-918X.
- "Sega: On the Rebound or On the Ropes?". Next Generation. No. 68. Imagine Media. October 2000. p. 8. ISSN 1078-9693.
- Fahey, Rob (20 May 2003). "Sega reports a profit, but top execs step down". GamesIndustry.biz. Gamer Network. Archived from the original on 11 July 2018. Retrieved 11 July 2018.
- Robinson, Martin (8 February 2015). "In media Rez: the return of Tetsuya Mizuguchi". Eurogamer. Gamer Network. Archived from the original on 20 November 2016. Retrieved 19 November 2016.
- Fahey, Rob (29 June 2004). "Sega development studios return to the fold". GamesIndustry.biz. Gamer Network. Archived from the original on 11 July 2018. Retrieved 11 July 2018.
- "Sega Co., Ltd. / Daiichi GE Research & Development Department (formerly Sonic Team Co., Ltd.)". plus.co.jp (in Japanese). PLUS Corporation, Ltd. Archived from the original on 21 August 2017. Retrieved 11 July 2018.
- "Interviews Creators: Morio Kishimoto & Etsuko Sugawara". sonic.sega.jp (in Japanese). Sonic Team. Archived from the original on 16 July 2017. Retrieved 11 July 2018.
- Frushtick, Russ (20 September 2012). "Life after Sega: The Sonic creator talks about being free of the hedgehog". Polygon. Vox Media. Archived from the original on 7 July 2018. Retrieved 7 July 2018.
- Inemoto, Tetsuya (28 December 2011). "Producer Takashi Iizuka speaks, "Sonic Generations White Space-Time Space / Blue Adventure" Production Secret Story and Sonic Series 20 Years of Progress". www.4gamer.net (in Japanese). Aetas, Inc. Archived from the original on 21 August 2017. Retrieved 11 July 2018.
- Higham, Rupert (6 October 2010). "Interview: Sonic Team's Takashi Iizuka". Kikizo. Superglobal Ltd. Archived from the original on 27 March 2018. Retrieved 27 March 2018.
- Jenkins, David (4 July 2017). "Sonic Mania and Sonic Forces hands-on preview and interview – 'The focus is on old school fans'". Metro Gaming. Associated Newspapers Ltd. Archived from the original on 27 June 2018. Retrieved 26 June 2018.
- Musgrave, Shaun (30 June 2015). "An Interview With Sonic Team's Takashi Iizuka About 'Sonic Runners'". TouchArcade. Archived from the original on 6 August 2018. Retrieved 18 August 2018.
- "Sonic Runners for iPhone/iPad Reviews". Metacritic. Archived from the original on 16 March 2016. Retrieved 19 August 2018.
- "Sega Networks Strategic Presentation" (PDF). Sega. 18 December 2015. p. 11. Archived (PDF) from the original on 1 June 2016. Retrieved 20 August 2018.
- Whitehead, Thomas (28 May 2016). "Sonic Runners, SEGA's Mobile Release by the Sonic Team, is Getting Shut Down". Nintendo Life. Archived from the original on 22 August 2018. Retrieved 20 August 2018.
- Hester, Blake (17 August 2017). "Sonic Mania is the Highest-Rated Sonic game in 15 Years". Rolling Stone. Archived from the original on 22 August 2017. Retrieved 21 August 2017.
- Skipper, Ben (25 July 2016). "Sega announces retro Sonic Mania and post-apocalyptic Project Sonic for 2017". International Business Times. IBT Media. Archived from the original on 17 September 2016. Retrieved 17 September 2016.
- Wong, Alistair (21 December 2018). "Sonic Team / Sega CS2 Developing The New Sakura Wars Game". Siliconera. Retrieved 5 April 2019.
- Capel, Chris J. (17 March 2019). "Next Sonic game has "begun production", but it probably won't be out this year". PCGamesN.
- IGN Staff (4 June 2001). "Interview With Sonic Adventure 2 Director Takashi Iizuka". IGN. Ziff Davis. Archived from the original on 23 March 2016. Retrieved 14 July 2018.
- IGN Staff (1 October 1999). "IGNDC Interviews Sonic Team's Yuji Naka". IGN. Ziff Davis. Archived from the original on 20 December 2015. Retrieved 14 July 2018.
- Jarvis, Matthew (1 April 2016). "Sonic Team head returns to US to establish development 'hub' for franchise". MCV. Future Publishing. Archived from the original on 14 July 2018. Retrieved 14 July 2018.
- "Sonic Adventure 2". IGN. Ziff Davis. Archived from the original on 21 December 2017. Retrieved 14 July 2018.
- Chau, Anthony (22 May 2001). "Chatting with SEGA Developers". IGN. Ziff Davis. Archived from the original on 8 December 2017. Retrieved 15 February 2014.
- Interview section. "Yuji Naka and Takashi Iizuka Speak on Sonic Heroes". Sega. Archived from the original on 21 March 2006. Retrieved 1 April 2014.
- "Takashi Iizuka Q&A". Nintendo Power. Future plc (173). November 2003.
- Deci, TJ. "Shadow the Hedgehog for GameCube Overview". Allgame. All Media Network. Archived from the original on 15 November 2014. Retrieved 26 January 2009.
- "Game of the week; Shadow the Hedgehog; GameCube/PS2/Xbox (rrp $79.95) Rating: 3.5/5". Herald Sun. Melbourne: News Corp Australia (1): F02. 26 February 2006.
- Klepek, Patrick (24 May 2005). "Shadow the Hedgehog Preview from 1UP.com". 1UP.com. Ziff Davis. Archived from the original on 8 November 2012. Retrieved 9 February 2009.
- Helgeson, Matt (January 2006). "Shadow the Hedgehog for GameCube Review". Game Informer. GameStop. Archived from the original on 26 May 2006. Retrieved 27 March 2009.
- Mueller, Greg (21 November 2005). "Shadow the Hedgehog for GameCube review". GameSpot. CBS Interactive. Archived from the original on 5 January 2014. Retrieved 25 June 2014.
- "Sega Sammy Holdings Annual Report 2006" (PDF). Sega Sammy Holdings. July 2006. p. 47. Archived (PDF) from the original on 30 March 2016. Retrieved 27 November 2017.
- "Fiscal Year Ended March 2007 Full Year Results" (PDF). Sega Sammy Holdings. 14 May 2007. p. 15. Archived (PDF) from the original on 29 July 2016. Retrieved 27 November 2017.
- Lomas, Ed (December 2000). Chrismas, Warren (ed.). "Sonic Team Player". Official Dreamcast Magazine (UK). No. 14. Dennis Publishing. p. 35.
- Gantayat, Anoop (20 April 2006). "Nights Set For Revolution?". IGN. Ziff Davis. Retrieved 24 February 2017.
- Chamberlain, Chad (20 November 2007). "Gamespeak: Nights: Journey of Dreams". CBS News. CBS Corporation. Archived from the original on 11 March 2017. Retrieved 1 December 2007.
- Casamassina, Matt (10 May 2007). "NiGHTS: Journey of Dreams Interview". IGN. Ziff Davis. Retrieved 25 February 2017.
- Taylor, Mike (5 December 2007). "Interview: Takashi Iizuka Talks NiGHTS". Nintendo Life. Nlife Media. Archived from the original on 3 March 2016. Retrieved 22 February 2017.
- "Nights: Journey of Dreams". IGN. Ziff Davis. Archived from the original on 10 October 2017. Retrieved 14 July 2018.
- Sharma, Made (1 December 2006). "GHZ Interviews (#1): Taylor Miller, Sonic Rivals producer". The GHZ. Archived from the original on 20 December 2015. Retrieved 14 July 2018.
- Lee, Dave (23 June 2011). "Twenty years of Sonic the Hedgehog". BBC News. Archived from the original on 15 September 2017. Retrieved 27 April 2018.
- Boutros, Daniel (4 August 2006). "A Detailed Cross-Examination of Yesterday and Today's Best-Selling Platform Games". Gamasutra. UBM plc. Archived from the original on 2 July 2016. Retrieved 12 November 2017.
- "This Month in Gaming History". Game Informer. Vol. 12 no. 105. January 2002. p. 117.
- Furfari, Paul. "15 Games Ahead of Their Time". 1UP.com. p. 2. Archived from the original on 20 October 2012. Retrieved 26 September 2011.
- "#23: Phantasy Star Online". IGN. 2012. Archived from the original on 24 November 2014. Retrieved 29 November 2014.
- Cork, Jeff (16 November 2009). "Game Informer's Top 100 Games Of All Time (Circa Issue 100)". Game Informer. Archived from the original on 8 April 2010. Retrieved 10 December 2013.
- "100 Greatest Games of All Time". Computer and Video Games. Future plc (218): 53–67. January 2000.
- "Sonic Team's Takashi Iizuka wants to make NiGHTS 3, Knuckles Chaotix 2". GamesTM. Imagine Publishing. 23 August 2010. Archived from the original on 6 April 2016. Retrieved 11 February 2012.
- Evans-Thirlwell, Edwin (24 August 2017). "Why did 3D Sonic struggle?". Eurogamer. Gamer Network Ltd. Archived from the original on 6 December 2017. Retrieved 28 June 2018.
- Stewart, Zolani (4 August 2014). "Where Sonic The Hedgehog Went Wrong". Kotaku. Gawker Media. Archived from the original on 13 December 2017. Retrieved 30 June 2018.
- Sato (7 July 2015). "Sega Learned About Making Quality Games From Atlus, Aim To Regain Trust From Players". Siliconera. Curse, Inc. Archived from the original on 30 June 2018. Retrieved 30 June 2018.
- Official website (in Japanese)