Software:Sonic CD

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Short description: 1993 video game
Sonic the Hedgehog CD
Cover art depicting Sonic fighting Metal Sonic for one of the Time Stones. The game's logo is shown atop the two; the Sega CD banner is on their left; and beneath them is the Sega logo, Seal of Quality, and the game's rating.
North American cover art
Developer(s)Sega
Publisher(s)Sega
Director(s)Naoto Ohshima
Producer(s)
  • Minoru Kanari
  • Makoto Oshitani
Programmer(s)Matsuhide Mizoguchi
Artist(s)
  • Hiroyuki Kawaguchi
  • Kazuyuki Hoshino
Composer(s)
  • Original release:
  • Naofumi Hataya
  • Masafumi Ogata
  • North America:
  • Spencer Nilsen
  • David Young
  • Mark "Sterling" Crew
SeriesSonic the Hedgehog
Platform(s)Sega CD, Windows, Android, PlayStation 3, Xbox 360, iOS, Apple TV
Release
Genre(s)Platform
Mode(s)Single-player

Sonic the Hedgehog CD[lower-alpha 1] is a 1993 platform game developed and published by Sega for the Sega CD. As Sonic the Hedgehog, the player attempts to protect an extraterrestrial body, Little Planet, from Doctor Robotnik. Like other Sonic games, Sonic runs through themed levels while collecting rings and defeating robots. Sonic CD introduces time travel as a game mechanic. By traveling through time, players can access different versions of stages, featuring alternative layouts, music, and graphics.

Sonic CD began as a port of the Sega Genesis game Sonic the Hedgehog (1991), but developed into a separate project. Led by Sonic's co-creator Naoto Ohshima, the developers sought to show off the technical capabilities of the Sega CD. Sonic CD features the debuts of the recurring Sonic characters Amy Rose and Metal Sonic, and includes animated cutscenes created by Toei Animation. Two soundtracks were composed: the one featured in the Japanese and European versions was composed by Naofumi Hataya and Masafumi Ogata, while the one in the North American version was composed by Spencer Nilsen, David Young, and Mark Crew.

Sonic CD was released in late 1993. It received critical acclaim and is often called one of the best Sonic and platform games. Reviewers praised its size, music, and time travel feature, although some felt it did not fully use the Sega CD's capabilities. It sold over 1.5 million copies, making it the bestselling Sega CD game. Sonic CD was ported to Windows as part of the Sega PC label in 1996, and to the PlayStation 2 and GameCube as part of Sonic Gems Collection in 2005. A remake, developed by Christian Whitehead using the Retro Engine, was released for various platforms in 2011 and rereleased as part of the Sonic Origins compilation in 2022.

Gameplay

A collage of Sonic in the four time periods in the Palmtree Panic level. Clockwise from left: past, present, good future, and bad future.
(Clockwise from top left) The past, present, good future, and bad future variants of the Palmtree Panic level

Sonic CD is a side-scrolling platform game similar to the original Sonic the Hedgehog. Players control Sonic the Hedgehog as he ventures to stop his nemesis Doctor Robotnik from obtaining the magical Time Stones and conquering a Little Planet.[1] Like previous games, Sonic can destroy enemies and objects (such as certain walls and television monitors containing power-ups[1]) by rolling into a ball, and collects rings as a form of health. Sonic can also perform a "spin dash" and a "super peel-out", both of which increase his speed.[2] The game has seven levels; each is split into three zones, the third of which ends in a boss fight against Robotnik. Players start with three lives, which are lost when they suffer any type of damage without rings in their possession; losing all lives results in a game over.[3][4]

Sonic CD is differentiated from other Sonic games through its time travel game mechanic, which allows players to access different versions of rounds set in the past, present and future. The music changes within the different time zones, as remixes of the present music.[5] Sonic starts the first two zones in the present. The third zone is always set in the future, its timeline dependent upon whether the player destroyed both transporters.[1] He travels through time by hitting signs labelled "past" or "future", maintaining his speed afterward.[6] By default, future stages are neglected and littered with machinery after Robotnik has conquered the Little Planet, appropriately named "bad futures."[6] Players are encouraged to convert each zone into a "good future", with bright colors, thriving nature, and few enemies.[6] To achieve a good future in each zone, players must travel to the past and destroy a hidden transporter where enemy robots spawn. Achieving a good future in every zone unlocks the game's best ending.[2][6]

By finishing a level with more than 50 rings, Sonic can access a special stage, in which he must destroy six UFOs in a pseudo-3D environment within a time limit.[1][5] Time is reduced swiftly if the player runs through water, though a special UFO which appears when time is running out grants extra time if destroyed. If the player destroys all the UFOs before the time runs out, they earn a Time Stone.[4] Collecting all seven Time Stones automatically creates a good future in every zone, unlocking the best ending.[2] The game also features a time attack mode, where players can replay completed levels for the fastest time possible; a "D.A. Garden", where players can listen to the music of completed zones; and a "Visual Mode", where players can view the opening and closing animations.[7] The game also includes a save feature, which uses the back-up memory of the Sega CD.[4]:20

Plot

Some time after his first adventure, Sonic CD opens with Sonic rushing to Never Lake, where an extraterrestrial body, Little Planet, appears in the last month of every year. His nemesis, Dr. Robotnik, has chained the planet to a mountain and begun transforming it into a giant fortress with his robot army. To execute his plan, Robotnik uses the Time Stones, seven diamonds which control the flow of time, hidden in the different zones. Sonic ventures into the planet, followed by the besotted Amy Rose, his self-proclaimed girlfriend.[lower-alpha 2] Robotnik dispatches his newest invention, Metal Sonic, to kidnap Amy at Collision Chaos, luring Sonic into danger.

After outrunning Metal Sonic in Stardust Speedway and saving Amy, Sonic fights and defeats Robotnik in his lair, Metallic Madness. Two endings exist, depending on whether or not the player collected the Time Stones or achieved a good future in each level. In the good ending, Little Planet thanks Sonic with a shower of stars and leaves Never Lake; in the bad ending, Little Planet still leaves, but Robotnik uses the Time Stones to bring it back and the player is urged to replay the game to achieve the good ending.

Development

Background and conception

Naota Ohshima
Sonic CD director Naoto Ohshima at the 2018 Game Developers Conference

The original Sonic the Hedgehog (1991) was developed by Sonic Team at Sega. It was a major commercial success and positioned Sega as Nintendo's main rival in the console market.[8] The lead programmer, Yuji Naka, dissatisfied with Sega of Japan's rigid corporate policies, moved with several members of Sonic Team to the United States to develop Sonic the Hedgehog 2 with Sega Technical Institute (STI).[9][10] Meanwhile, Sega planned to release the Sega CD add-on for its Genesis, and wanted a Sonic game that would demonstrate its more advanced features. Naoto Ohshima, the designer of Sonic, was Sonic CD's director; the remainder of the team comprised Sega staff who had developed The Revenge of Shinobi, Golden Axe II, and Streets of Rage. The team built Sonic CD using the original Sonic the Hedgehog code as a base.[11]

Sonic CD was conceived as an enhanced port of Sonic the Hedgehog for the Sega CD, but it gradually developed into a separate project.[11] It was titled CD Sonic the Hedgehog first[12] before being renamed Sonic CD.[13] Ohshima does not consider Sonic CD a sequel to Sonic the Hedgehog or Sonic 2, although the artist Yasushi Yamaguchi said its story may be set between the two.[14]

Design

Sonic the Hedgehog had a balance on speed and platforming; STI built on the speed with Sonic 2's more focused level designs. However, Ohshima's team sought to focus on the platforming and exploration aspects.[11] Ohshima said, "our ideas were to make the world and setting larger, and to add more replayability, so it would be something you could enjoy playing for a long time".[14] According to artist Kazuyuki Hoshino, because it was a Sega CD game, the team wanted Sonic CD to stand out compared to previous Sonic games. Visually, the game was designed to resemble CG imagery; the Sonic sprite on the title screen was based on a Sonic figurine by Taku Makino that the team photographed and scanned.[14]

Sonic CD marks the debuts of Amy Rose and Metal Sonic, both designed by Hoshino. Although Hoshino created Amy's in-game graphics, many staff members contributed ideas to her design. Her headband and trainer shoes reflected Ohshima's tastes while her mannerisms reflected the traits Hoshino looked for in women at the time. Hoshino designed Metal Sonic in response to Ohshima wanting a strong rival for Sonic. Hoshino had a clear image of Metal Sonic in his mind from the moment he was briefed, and his design emerged after only a few sketches. The character graphics were created using Sega's proprietary graphics system for the Genesis, the "Sega Digitizer MK-III", featuring a bitmap and animation editor. The team mostly used Macintosh IIcis. Graphics data was stored on 3.5-inch floppy disks, which were handed to the programmer to work into the game.[15] Though Naka was not directly involved with Sonic CD, he exchanged design ideas with Ohshima.[16]

Ohshima cited the film Back to the Future (1985) as an influence on the time travel.[16] The developers designed four variants of each stage (one for each time period).[17] Ohshima hoped for the time period to change instantly with a "sonic boom" effect, but the programmers argued this was impossible and produced a loading sequence instead.[16] Sega did not pressure the team developing Sonic CD as much as the one developing Sonic 2. Ohshima felt this was because Sonic CD is not a numbered sequel; he considered it a recreation of the original game.[16] The total game data of Sonic CD is 21 megabytes (MB), compared to Sonic 2's 1 MB.[11] The game includes animated cutscenes produced by Studio Junio; the team used a format that provided uncompressed imagery to the video display processor, which allowed for superior results in contrast to the Cinepak compression used for other Sega CD games.[11] The special stages feature Mode 7-like background plane manipulation effects.[18] An underground dungeon stage was cut early in development as it did not fit the Sonic gameplay.[19]

Music

The Japanese soundtrack was composed by Naofumi Hataya and Masafumi Ogata, who had worked together on the 8-bit version of Sonic the Hedgehog 2.[citation needed] It features two songs, "Sonic — You Can Do Anything" (often referred to as "Toot Toot Sonic Warrior"),[20] composed by Ogata and originally written for Sonic the Hedgehog 2, and "Cosmic Eternity — Believe in Yourself", composed by Hataya. Both are sung by Keiko Utoku.[21] The composers drew inspiration from house and techno acts including C+C Music Factory, Frankie Knuckles and the KLF.[22]

Sega of America delayed the North American release of Sonic CD for two months to have a new soundtrack written and produced by Spencer Nilsen and David Young of Sega Multimedia Studio.[23] Some tracks were written and produced by the keyboardist Mark "Sterling" Crew[24][25][better source needed] and feature the percussionist Armando Peraza, both of whom had worked with Santana.[26] According to Nilsen, Sega's American marketing division believed Sonic CD needed a more "rich and complex" soundtrack and a theme song they could use to promote it.[27] "Sonic — You Can Do Anything" and "Cosmic Eternity — Believe in Yourself" were replaced with "Sonic Boom", composed by Nilsen and performed by the female vocal group Pastiche.[27][28] The tracks in the "Past" stages could not be replaced as they were sequenced PCM audio tracks rather than streamed Mixed Mode CD audio.[29]Template:Not in source given

Release

Sonic CD was released in Japan on September 23, 1993.[30] After being delayed for the new soundtrack, it was released worldwide in North America and Europe in November 23, 1993 alongside Sonic Chaos and Sonic Spinball as part of Sega's "Sonic Three on One Day" release strategy.[31][32] Sonic CD was the flagship game for Sega CD and its only Sonic game.[33] An enhanced version of the original Sonic the Hedgehog and a Sonic-themed port of Popful Mail were canceled.[34][35]

Rereleases

A Sega CD attached to a Sega Genesis.
Sonic CD was originally released for the Sega CD (seen here attached below the Genesis).

Two versions of Sonic CD were released for Windows: one in 1995 for Pentium processors, and another in 1996 for DirectX.[11] The Pentium version was only bundled with new computers and never sold in stores; Sega worked with Intel to make the game work properly.[11] The DirectX version was released under the Sega PC label[36] and distributed by SoftKey in North America on July 8[37] and in Japan on August 9.[36] This version is mostly identical to the original release,[38] but loading screens were added[11] and it is only compatible with older versions of Windows.[39] Both Windows versions use the North American soundtrack.[11]

The 1996 Windows version was ported to the GameCube and PlayStation 2 in August 2005 for Sonic Gems Collection.[11][40] This port uses the original soundtrack in Japan and the North American soundtrack elsewhere.[41][28] The ports introduced some graphical problems, such as a blurry anti-flicker presentation,[11] but the opening animation is presented in a higher quality fullscreen view.[42]

In 2009, independent programmer Christian Whitehead produced a proof-of-concept video of a remastered version of the game, using his Retro Engine, running on iOS.[43][44] Sega released this version in December 2011 for Android, iOS, PlayStation 3, and Xbox 360, and later in January 2012 for Windows via Steam with assistance from BlitWorks in the PC and console ports.[45] The remaster features enhancements such as widescreen graphics, fine-tuned collision detection to make time traveling more consistent, refined visuals and frame rate for Special Stages, the option for spin dash physics from Sonic the Hedgehog 2, both the Japanese and North American soundtracks, the ability to unlock Tails as a playable character, and achievement and trophy support.[46][47][48][49] Whitehead designed two original stages, but they were excluded as Sega wanted to keep the game faithful to the original release.[50] The remaster was not released on the Wii as it exceeded the WiiWare download size.[51] It was included in the 2022 compilation Sonic Origins,[52] which removed voice lines for Sonic and Amy.[53] Amy herself and Knuckles also became selectable characters for the game in a later update to Origins.[54]

Reception

Reception (Sega CD)
Review scores
PublicationScore
CVG85%[2]
EGM34/40[55][lower-alpha 3]
GamePro5/5[56]
Electronic Games92%[1]
Entertainment WeeklyA−[57]
Sega Force Mega85%[58]
Sega Magazine87%[3]
Sega Pro90%[5]
Awards
PublicationAward
Electronic Gaming MonthlyBest Sega CD Game of 1993[59]
GameProBest CD Game of 1993[60]

The Sega CD version sold more than 1.5 million copies, making it the system's best-seller.[61][62] In the United Kingdom, it was the top-selling Mega CD game in December 1993.[63]

The game received critical acclaim.[1][5][59] The presentation, visuals, and audio were praised. Computer and Video Games wrote that, although Sonic CD did not use the Sega CD's capabilities to its fullest, the game's graphics and sound were still excellent, calling the music "from the likes of 2Unlimited and Bizarre Inc".[2] Electronic Games said that the game looked similar to older games and used the Sega CD's special features minimally, but this did not detract from the quality. The music was singled out as making Sonic CD "stand above the crowd"; the reviewer wrote that it helped add richness to the game.[1] The reviewers of Electronic Gaming Monthly (EGM) praised the game's animated cinematics and sound, but noted frame rate drops during special stages.[55] Retrospective opinions of the presentation have also been positive. IGN praised its vibrant colors and felt the game looked nice,[64] and GamesRadar thought its music stood the test of time, writing: "What must've dated very quickly in the 1990s is somehow totally fresh today".[18]

Critics were divided over the change of soundtrack in the North American versions. GameFan, which had given the Japanese version of Sonic CD a score of 100%, lambasted the change.[65][66] GameFan editor Dave Halverson called the change "an atrocity that remains the biggest injustice in localization history".[67] The reviewer for GamesRadar said he shut his GameCube off in disgust when he realized Sonic Gems Collection used the American soundtrack.[18] In a 2008 interview, Nilsen said "I think critics were looking for a way to bash the game... it was like we replaced the music for Star Wars after the movie had been out for a while."[27]

The gameplay was also widely praised. EGM admired the diverse levels and felt the time travel added depth.[55] Electronic Games wrote that Sonic CD played as well as previous Sonic games, and that the time travel—coupled with large levels rich with secrets and Super Mario Kart-like special stages—added replayability.[1] Sega Pro also noted the expanded environments and the replay value travel added by the time travel, writing that "the more you play Sonic CD the better it gets", but felt the game was too easy.[5] In its debut issue, Sega Magazine said Sonic CD was "potentially a classic".[3] GameSpot singled out the "interesting level design and the time-travelling gameplay" as a major selling point, saying it provided a unique take on the classic Sonic formula.[6]

Critics wrote that Sonic CD was one of the best Sega CD games. Electronic Games called it a must-have,[1] and Sega Pro said it was "brilliant", imaginative and worth more than its price.[5] Destructoid described it as "a hallmark of excellence", creative, strange, and exciting, and said that "to miss Sonic CD would be to miss some of the franchise's best".[68]

Reception to later versions of Sonic CD varied. GameSpot considered the 1996 Windows version inferior, criticizing its technical performance and "tedious and monotonous" gameplay. The reviewer wrote that "those who have played Sonic on a Sega game system will find nothing new here" and that it was not worth its $50 price.[38] Reviews of the version in Sonic Gems Collection were favorable. IGN remembered Sonic CD as one of the best things about the Sega CD and called it a standout for the compilation, and a major selling point.[41] Eurogamer wrote: "Rejoice for Sonic CD... Just don't rejoice for anything else [in Sonic Gems Collection], because it's mostly rubbish."[69] According to Metacritic, the 2011 console version received "generally favorable reviews",[70][71] while the iOS version received "universal acclaim".[72] Sonic CD is frequently named among the best Sonic games and platform games.[73][74][75][76][77] In 1997, EGM named it the 17th best console game of all time, citing the bonus levels and animated intro.[78]

Legacy

The story of Sonic CD was adapted in the twenty-fifth issue of Archie Comics' Sonic the Hedgehog comic book series. The adaptation featured some changes to the story, such as Tails being an important character and Metal Sonic having the ability to talk.[79] British publisher Fleetway Publications published their own adaptation in Sonic the Comic.[80] The final issue of Archie's comic, #290 (December 2016), also featured a retelling of the game's story.[81]

Two characters introduced in Sonic CD, Amy Rose and Metal Sonic, became recurring characters in the Sonic series. Metal Sonic appeared as an antagonist in Knuckles' Chaotix (1995), the Sonic the Hedgehog anime film (1996),[82] Sonic Heroes (2003),[83] Sonic the Hedgehog 4: Episode II (2012)[84] and Sonic Mania (2017). Amy Rose most notably appears in Sonic Adventure.[85] The Sonic CD animated sequences were included as bonuses in the compilation Sonic Jam (1997), and "Sonic Boom" was used as one of Sonic's themes in Super Smash Bros. Brawl (2008).[27][86]

In 2011, for the Sonic franchise's 20th anniversary, Sega released Sonic Generations, which includes remakes of various Sonic stages. Both versions feature a re-imagined version of the boss battle against Metal Sonic.[87] Sonic Mania, produced for the series' twenty-fifth anniversary, features updated versions of Sonic CD's Metallic Madness and Stardust Speedway levels, including a boss battle against Metal Sonic.[88][89][90]

Notes

  1. ↑ Japanese: ソニック・ザ・ヘッジホッグCD (シーディー) Hepburn: Sonikku za Hejjihoggu Shī Dī
  2. ↑ In the North American manual, Amy is incorrectly identified as Princess Sally, a character from DIC's Sonic the Hedgehog television series.
  3. ↑ EGM provided four scores of 9, 9, 8, 8 from individual reviewers.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Camron, Marc (December 1993). "CD Gallery". Electronic Games 2 (3): 140. https://retrocdn.net/index.php?title=File:ElectronicGames2_US_15.pdf&page=140. Retrieved December 19, 2017. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Rand, Paul (November 1993). "Review: Sonic CD". Computer and Video Games (144): 87. https://retrocdn.net/images/d/d0/CVG_UK_144.pdf#page=87. Retrieved August 29, 2017. 
  3. ↑ 3.0 3.1 3.2 "Review: Sonic CD". Sega Magazine (1). January 1994. https://retrocdn.net/images/1/19/SegaMagazine_UK_01.pdf. 
  4. ↑ 4.0 4.1 4.2 Sonic Team (November 1993). Sonic the Hedgehog CD instruction manual. Sega. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 "Sonic the Hedgehog CD". Sega Pro: 38–40. November 1993. https://info.sonicretro.org/Review_-_Sonic_the_Hedgehog_CD_(Sega_Pro,_November_1993). Retrieved February 8, 2018. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Kemps, Heidi (January 3, 2012). "Sonic CD Review". https://www.gamespot.com/reviews/sonic-cd-review/1900-6348147/. 
  7. ↑ "Sonic CD PS3 Cheats". January 5, 2012. https://www.gamerevolution.com/guides/53880-sonic-cd-ps3-cheats. 
  8. ↑ "This Month in Gaming History". Game Informer 12 (105): 117. January 2002. 
  9. ↑ Smith, Sean (June 2006). "Company Profile: Sonic Team". Retro Gamer (Imagine Publishing) (26): 24–29. https://archive.org/details/RetroGamerIssue026-030/page/n23. Retrieved October 12, 2019. 
  10. ↑ Day, Ashley (March 2007). "Company Profile: Sega Technical Institute". Retro Gamer (Imagine Publishing) (36): 28–33. 
  11. ↑ 11.00 11.01 11.02 11.03 11.04 11.05 11.06 11.07 11.08 11.09 11.10 Linneman, John (April 8, 2018). "DF Retro: Sonic CD - under-appreciated but still brilliant today". Gamer Network. https://www.eurogamer.net/amp/digitalfoundry-2018-revisiting-sonic-cd-retro. 
  12. ↑ "CD Sonic the Hedgehog". Electronic Gaming Monthly (44): 122. March 1993. https://archive.org/stream/ElectronicGamingMonthly_201902/Electronic%20Gaming%20Monthly%20Issue%20044%20%28March%201993%29#page/n119/mode/2up. Retrieved October 12, 2019. 
  13. ↑ Kai, Norton (April 1993). "Sonic CD Splits Up". Sega Force (16): 12. 
  14. ↑ 14.0 14.1 14.2 "Sonic CD – Developer Interview Collection". March 24, 2020. http://shmuplations.com/soniccd/. 
  15. ↑ Stuart, Keith (2014). "Interview with Kazuyuki Hoshino, Art Director". Sega Mega Drive/Genesis: Collected Works. Read-Only Memory. pp. 289–290. ISBN 9780957576810. 
  16. ↑ 16.0 16.1 16.2 16.3 Sheffield, Brandon (December 4, 2009). "Out of the Blue: Naoto Ohshima Speaks". http://www.gamasutra.com/view/feature/132596/out_of_the_blue_naoto_ohshima_.php?page=2. 
  17. ↑ "Sega's Yuji Naka Talks!". IGN. http://xbox.gamespy.com/articles/654/654750p2.html. 
  18. ↑ 18.0 18.1 18.2 Towell, Justin (December 16, 2011). "Sonic CD review". https://www.gamesradar.com/sonic-cd-review/. 
  19. ↑ Baxter, Daryl (2023-12-22). "EXCLUSIVE: From Sega CD to iPhone SSD, Sonic designer Naoto Ohshima talks 30 years of Sonic CD, Sonic Superstars, secret levels and sequels" (in en). https://www.imore.com/gaming/for-me-sonic-cd-isnt-just-a-sequel-sonics-designer-speaks-to-imore-for-its-30th-anniversary. 
  20. ↑ McFerran, Damien. "How Sega can save its mascot with Sonic Mania". https://www.redbull.com/int-en/how-sega-can-fix-sonic-mania-red-bull-games. 
  21. ↑ "Sonic Joins the Digital Revolution". Electronic Gaming Monthly 6 (8): 92. August 1993. 
  22. ↑ Stuart, Keith (2014). "Interview with Naofumi Hataya". Sega Mega Drive/Genesis: Collected Works. Read-Only Memory. pp. 312. ISBN 9780957576810. 
  23. ↑ "Sega-16 – Interview: Spencer Nilsen (Composer)" (in en-US). https://www.sega-16.com/2008/12/interview-spencer-nilsen/. 
  24. ↑ "Sterling Crew" (in en). https://www.discogs.com/artist/717989-Sterling-Crew. 
  25. ↑ "Ending for Sonic the Hedgehog CD (Sega CD)". http://www.vgmuseum.com/end/scd/a/soncd.htm. 
  26. ↑ "Q&A: A Conversation with Armando Peraza". http://www.salsaweb.com/music/articles/peraza_cm.htm. 
  27. ↑ 27.0 27.1 27.2 27.3 Horowitz, Ken (December 9, 2008). "Interview: Spencer Nilsen (Composer)". https://www.sega-16.com/2008/12/interview-spencer-nilsen/. 
  28. ↑ 28.0 28.1 Gibson, Ellie (July 4, 2005). "Sonic Gems line-up in doubt". http://www.eurogamer.net/articles/news040705sonicgems. 
  29. ↑ Elston, Brett (April 28, 2009). "17 videogame soundtracks ahead of their time". http://www.gamesradar.com/17-videogame-soundtracks-ahead-of-their-time/2/. 
  30. ↑ "[セガハード大百科 メガＣＤ対応ソフトウェア"]. Sega. http://sega.jp/archive/segahard/mcd/soft.html. 
  31. ↑ "Sonic the Hedgehog CD". GamePro 6 (1). 
  32. ↑ "Sega names the day". Evening Post: pp. 13. November 20, 1993. https://www.newspapers.com/image/820094030/?terms=%22sonic%20cd%22%20%22november%2023%22&match=1. "On November 23 Sega will be releasing their trio of Sonic titles. Sonic Three on One Day, as it will now be known sees the worldwide release of Sonic CD (Mega CD), Sonic Spinball (Mega Drive) and Sonic Chaos on Master System and Game Gear." 
  33. ↑ Elston, Brett (April 9, 2008). "The rise, fall and deafening crash of Sonic the Hedgehog". p. 1. http://www.gamesradar.com/the-rise-fall-and-deafening-crash-of-sonic-the-hedgehog/. 
  34. ↑ "Coming Attractions". MegaPlay 3 (11): 30. August 1992. 
  35. ↑ "Sonic's Dad!". Electronic Gaming Monthly (49): 71. August 1993. https://archive.org/stream/ElectronicGamingMonthly_201902/Electronic%20Gaming%20Monthly%20Issue%20049%20%28August%201993%29#page/n71/mode/2up. Retrieved October 12, 2019. 
  36. ↑ 36.0 36.1 "Windows". http://sonic.sega.jp/SonicChannel/gametitle/Windows.html. 
  37. ↑ "Sonic CD [1996 - PC"]. Ziff Davis. http://www.ign.com/games/sonic-cd/pc-8740. 
  38. ↑ 38.0 38.1 Blevins, Tal (September 19, 1996). "Sonic CD (1995) Review". https://www.gamespot.com/reviews/sonic-cd-review/1900-2533119/. 
  39. ↑ Procter, Lewie (September 5, 2011). "No Disc Required: Sonic CD Heading To PC". Rock, Paper, Shotgun. https://www.rockpapershotgun.com/2011/09/05/no-disc-required-sonic-cd-heading-to-pc/. Retrieved April 15, 2017. 
  40. ↑ "Blog: I like burning hedgehogs". October 22, 2009. http://blog.hardcoregaming101.net/2009/10/i-like-burning-hedgehogs.html. 
  41. ↑ 41.0 41.1 "Sonic Gems Collection - IGN". August 19, 2005. http://www.ign.com/articles/2005/08/19/sonic-gems-collection. 
  42. ↑ "Sonic Gems Collection". Nintendo Power (Future plc) (195): 40. September 2005. 
  43. ↑ Sigl, Rainer (February 1, 2015). "Lieblingsspiele 2.0: Die bewundernswerte Kunst der Fan-Remakes". Der Standard. http://derstandard.at/2000011074333/Lieblingsspiele-neugemacht-Die-bewundernswerte-Kunst-der-Fan-Remakes. 
  44. ↑ Hodapp, Eli (29 July 2009). "Christian Whitehead On 'Sonic CD' and His Retro Engine". TouchArcade. http://toucharcade.com/2009/07/29/christian-whitehead-on-sonic-cd-and-his-retro-engine/. 
  45. ↑ "BlitWorks - SONIC CD". https://blitworks.com/sonic_cd/. 
  46. ↑ "Proof Of Concept Of Enhanced Sonic CD On iPhone | WatchPlayRead - "It's What We Do!"". WatchPlayRead. 2009-07-28. http://watchplayread.com/proof-of-concept-of-enhanced-sonic-cd-on-iphone/. 
  47. ↑ "Sonic CD coming to XBLA, PSN and more this holiday | WatchPlayRead - "It's What We Do!"". WatchPlayRead. 2011-08-25. http://watchplayread.com/sonic-cd-coming-to-xbla-psn-and-more-this-holiday/. 
  48. ↑ "SEGA Blog | Sonic CD Spins Onto Tablets at GameStop". Blogs.sega.com. http://blogs.sega.com/2011/11/01/sonic-cd-spins-onto-tablets-at-gamestop/. 
  49. ↑ "SEGA Blog | #SegaPAX – Sonic CD Announced!". Blogs.sega.com. 2011-08-25. http://blogs.sega.com/2011/08/25/segapax-%E2%80%93-sonic-cd-announced/#more-9208. 
  50. ↑ Nelson, Jared (May 6, 2014). "Play 'Sonic The Hedgehog 2' Hidden Palace Zone in Prototype Form with this New Easter Egg". http://toucharcade.com/2014/05/06/sonic-2-hidden-palace-zone-playable-prototype/. 
  51. ↑ Holmes, Jonathan (August 27, 2011). "Sonic CD is too big to come to WiiWare". https://www.destructoid.com/sonic-cd-is-too-big-to-come-to-wiiware-210001.phtml. 
  52. ↑ May 2021, Hope Bellingham 27 (2021-05-27). "Sonic: Origins brings Sonic the Hedgehog 1, 2, 3, & Knuckles to current gen consoles" (in en). https://www.gamesradar.com/sonic-origins-brings-sonic-the-hedgehog-1-2-3-and-knuckles-to-current-gen-consoles/. 
  53. ↑ Bevan, Rhiannon (2022-06-25). "Sonic CD's Voice Lines Have Been Removed In Origins, For Some Reason" (in en-US). https://www.thegamer.com/sonic-origins-cd-voice-lines-im-outta-here/. 
  54. ↑ "Sonic Origins Plus Adds Amy As Playable Character, Game Gear Games, And More This June". Game Informer. https://www.gameinformer.com/2023/03/23/sonic-origins-plus-adds-amy-as-playable-character-game-gear-games-and-more-this-june. Retrieved June 28, 2023. 
  55. ↑ 55.0 55.1 55.2 "Review Crew: Sonic CD". Electronic Gaming Monthly 6 (11): 48. November 1992. https://info.sonicretro.org/index.php?title=File:EGM_US_052.pdf&page=48. Retrieved December 19, 2017. 
  56. ↑ The Unknown Gamer (January 1994). "Sega CD ProReview: Sonic the Hedgehog CD". GamePro: 64–68. https://retrocdn.net/images/e/ec/GamePro_US_054.pdf. 
  57. ↑ "Sonic CD; Sonic Chaos; Sonic Spinball; Sonic 3". Entertainment Weekly. https://ew.com/article/1994/02/11/sonic-cd-sonic-chaos-sonic-spinball-sonic-3/. 
  58. ↑ Chris; Mark (January 1994). "Sonic the Hedgehog CD". Sega Force Mega 2 (7): 102–4. 
  59. ↑ 59.0 59.1 Electronic Gaming Monthly's Buyer's Guide. 1994. 
  60. ↑ "Editor's Choice Awards". GamePro (IDG) (55): 24. February 1994. 
  61. ↑ Official Gallup UK Mega-CD sales chart, February 1994, published in Mega issue 17
  62. ↑ Records, Guinness World (2015). Guinness World Records 2016: Gamer's Edition. ISBN 978-1910561096. 
  63. ↑ "Charts". Computer & Video Games (Future plc) (147 (February 1994)): 12. 15 January 1994. https://retrocdn.net/images/4/4c/CVG_UK_147.pdf. 
  64. ↑ DeVries, Jack (December 15, 2011). "Sonic CD Review". https://www.ign.com/articles/2011/12/16/sonic-cd-review-2. 
  65. ↑ Skid; Sgt. Gamer; K. Lee; The Enquirer (November 1993). "Sonic CD - Sega CD - 1 Player". GameFan: 22. https://archive.org/details/GamefanVolume1Issue12/page/n21. Retrieved January 1, 2020. 
  66. ↑ Skid; Sgt. Gamer; K. Lee; Brody (January 1994). "Sonic CD Re-Review - Sega - Sega CD - 1 Player". GameFan: 18. https://archive.org/details/GamefanVolume2Issue02January1994ALT2/page/n17. Retrieved January 1, 2020. 
  67. ↑ Elston, Brett (April 28, 2009). "17 videogame soundtracks ahead of their time". p. 2. https://www.gamesradar.com/17-videogame-soundtracks-ahead-of-their-time/2/. 
  68. ↑ North, Dale (December 15, 2011). "Review: Sonic CD". https://www.destructoid.com/review-sonic-cd-217985.phtml. 
  69. ↑ Bramwell, Tom (October 6, 2005). "Sonic Gems Collection". https://www.eurogamer.net/articles/r_sonicgems_gc. 
  70. ↑ "Sonic CD for PlayStation 3 Reviews". https://www.metacritic.com/game/sonic-cd/critic-reviews/?platform=playstation-3. 
  71. ↑ "Sonic CD for Xbox 360 Reviews". https://www.metacritic.com/game/sonic-cd/critic-reviews/?platform=xbox-360. 
  72. ↑ "Sonic CD for iPhone/iPad Reviews". https://www.metacritic.com/game/sonic-cd/critic-reviews/?platform=ios-iphoneipad. 
  73. ↑ "The best Sonic games of all time". October 29, 2013. p. 3. https://www.gamesradar.com/best-sonic-games/3/. 
  74. ↑ "Gotta Go Fast: Ranking All of The Sonic The Hedgehog Games". August 8, 2017. https://www.usgamer.net/articles/gotta-go-fast-ranking-all-of-the-sonic-the-hedgehog-games. 
  75. ↑ Towell, Justin (2013-02-06). "Why Sonic CD is one of the greatest games ever made". GamesRadar. https://www.gamesradar.com/why-sonic-cd-one-greatest-games-all-time/. 
  76. ↑ Noble, McKinley. "The 20 Best Platformers: 1989 to 2009". GamePro. http://www.gamepro.com/article/features/210106/the-20-best-platformers-1989-to-2009-page-3. 
  77. ↑ "25 Best iPhone and iPad Games of 2011". December 31, 2011. http://www.metacritic.com/feature/best-iphone-ipad-games-of-2011. 
  78. ↑ "100 Best Games of All Time". Electronic Gaming Monthly (Ziff Davis) (100): 148. November 1997.  Note: Contrary to the title, the intro to the article (on page 100) explicitly states that the list covers console video games only, meaning PC games and arcade games were not eligible.
  79. ↑ Flynn, Ian; Penders, Ken; Gallagher, Mike; Kanterovich, Mike (July 18, 2012). Sonic: The Games - Classic. Archie Comics. ISBN 978-1619883437. https://books.google.com/books?id=TcdDBPG-39YC&q=Sonic+CD&pg=PT24. Retrieved 11 February 2018. 
  80. ↑ "Paper with Attitude". GamesTM. 2009. 
  81. ↑ Sims, Chris (December 27, 2016). "Meet Amy Rose For The First Time (Again) In 'Sonic the Hedgehog' #290 [Preview"]. https://comicsalliance.com/sonic-the-hedgehog-290-preview/. 
  82. ↑ "Chaos Over Knuckles". Mean Machines Sega (29): 08. March 1995. https://archive.org/stream/mean-machines-sega-magazine-29#page/n7/mode/2up. Retrieved October 12, 2019. 
  83. ↑ Sonic Team USA (December 30, 2003). Sonic Heroes. Sega. Level/area: Metal Overlord. 
  84. ↑ Fletcher, JC (April 10, 2012). "Sonic 4 Episode 2 'locks on' to Episode 1 to add Metal Sonic". https://www.engadget.com/2012/04/10/sonic-4-episode-2-locks-on-to-episode-1-to-add-metal-sonic/. 
  85. ↑ Gies, Arthur (September 23, 2010). "Sonic Adventure Review". https://www.ign.com/articles/2010/09/23/sonic-adventure-review. 
  86. ↑ "Full Song List with Secret Songs - Smash Bros. DOJO!!". https://www.smashbros.com/wii/en_us/music/music24_list.html. 
  87. ↑ Thomas, Kurt (July 13, 2011). "Metal Sonic Charges Into Sonic Generations". Game Informer. https://www.gameinformer.com/b/news/archive/2011/07/13/metal-sonic-charges-into-sonic-generations.aspx. Retrieved November 23, 2011. 
  88. ↑ Kemps, Heidi (August 14, 2017). "Sonic Mania Review". https://www.ign.com/articles/2017/08/14/sonic-mania-review. 
  89. ↑ Sampson, Aaron (August 14, 2017). "Sonic Mania Metallic Madness Zone Act 1 - Gameplay". https://www.gamespot.com/videos/sonic-mania-metallic-madness-zone-act-1-gameplay/2300-6440369/. 
  90. ↑ "Sonic Mania - Fighting Metal Sonic". August 16, 2017. https://www.ign.com/videos/2017/08/16/sonic-mania-fighting-metal-sonic. 

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