Sonic the Hedgehog 4: Episode I

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Sonic the Hedgehog 4: Episode I
S4,EP1 boxart.png
Director(s)Toshiyuki Nagahara
Designer(s)Yukihiro Higashi
Programmer(s)Katsuya Kuramoto
  • Hideaki Moriya
  • Yuji Uekawa
  • Shinji Matsuura
  • Michikazu Tamamura
Composer(s)Jun Senoue
SeriesSonic the Hedgehog
Platform(s)iOS, Wii, PlayStation 3, Xbox 360, Windows, Windows Phone, Android, BlackBerry Tablet OS

Sonic the Hedgehog 4: Episode I[a] is a 2010 side-scrolling platform game developed by Dimps, with assistance from Sonic Team, and published by Sega. It is part of the Sonic the Hedgehog series and acts as a sequel to Sonic & Knuckles (1994). Episode I follows Sonic as he sets out to stop Doctor Eggman, who has returned following his defeat in Sonic & Knuckles. The game returns to the Sega Genesis style of Sonic gameplay, with movement restricted to a 2D plane. Like previous Sonic games, the player races through levels, collecting rings while rolling into a ball to attack enemies. The game also features special stages in which the player collects Chaos Emeralds and online leaderboards comparing level completion times and high scores.

Development began in June 2009 and lasted a year and a half. The game was conceived as a smartphone-exclusive spin-off before becoming a multiplatform, mainline Sonic installment. It was designed to appeal to both older Sonic fans who played the Genesis games and newer ones who played later games like Sonic Unleashed (2008). As a continuation of the classic Sonic titles, Episode I features no voice acting, a simple control scheme, level design emphasizing platforming and momentum-based gameplay, and no player characters besides Sonic himself; however, it incorporates Sonic's design and homing attack ability from Sonic Adventure (1998). Producer Takashi Iizuka and composer Jun Senoue were the only Sonic 4 developers who contributed to the Genesis games.

Episode I was released worldwide in October 2010 as a downloadable game for iOS, PlayStation 3, Wii, and Xbox 360. A release for Windows Phone followed in June 2011, for Windows and Android in January 2012, for BlackBerry Tablet OS in July 2012, and for Ouya in July 2013. The game received moderately positive reviews and sold over a million copies in under a year. Critics described Episode I as a satisfying return to classic Sonic gameplay and praised the sense of nostalgia. Criticism was directed at its physics engine, considered inferior to that of the Genesis games, and its short length. Episode I was envisioned as the first of an episodic video game trilogy. Sonic the Hedgehog 4: Episode II was released in May 2012, while Episode III was never made.


Sonic the Hedgehog 4: Episode I is a side-scrolling platform game similar in gameplay and style to the 1990s Sonic the Hedgehog games for the Sega Genesis. The story begins shortly after the events of Sonic & Knuckles (1994). Sonic the Hedgehog parts with his friends, Miles "Tails" Prower and Knuckles the Echidna, to explore new territories on his own. However, series antagonist Doctor Eggman—who survived his defeat in Sonic & Knuckles—resurfaces, refines some of his past robots, and initiates a plan to get rid of Sonic. Sonic 4 is presented from a 2.5D perspective; although movement is restricted to a 2D plane, characters and objects are rendered in 3D. Sonic, the only player character of the single-player game, can move left or right to gain speed, jump, and roll into a ball to attack enemy robots. Sonic can also perform the "homing attack" from the 3D Sonic games; when in midair, he can lock on to robots or objects and home in on them. In some cases, chaining homing attacks opens access to alternate pathways.

Sonic races around a corkscrew in the game's first level. Sonic 4 returns to the 2D gameplay of the classic Sonic games released for the Sega Genesis in the 1990s.

The game takes place across four levels called zones, each split into three acts. Unlike the Genesis Sonic games, after completing the first act, the player can freely choose which zone to play via a world map. The levels are based on locations from the original Sonic the Hedgehog (1991) and Sonic the Hedgehog 2 (1992),[b] and feature elements such as slopes, bottomless pits, vertical loops, corkscrews, springs, and boost pads, as well as power-ups like shields, invincibility, and speed shoes. Some levels feature unique elements, like vines or pinball flippers and bumpers. After the player completes a zone's acts, they unlock a boss encounter with Eggman. Boss encounters feature Eggman piloting one of his robots, and the player must hit him eight times to defeat him. Completing all four zones unlocks a fifth and final level. Like other Sonic games, Sonic collects rings as a form of health: if the player is in possession of at least one ring and is hit by an enemy or hazard, they will survive, but their rings will scatter and blink before disappearing. If the player is hit with no rings, falls in a pit, or drowns, they lose a life, and will receive a game over if all lives are lost.

If the player finishes an act with 50 or more rings, they will have the option to access a special stage.[1] The special stages in Episode I are based on those from Sonic the Hedgehog, in which Sonic is curled in a ball and bounces off the bumpers and walls of a fully rotating maze. The player must tilt the playing field to navigate Sonic through the maze within a time limit, collecting rings to open gates and time bonuses along the way. Finishing the special stage rewards the player with one of the seven Chaos Emeralds. By collecting all seven, the player unlocks the ability to transform into Super Sonic, granting them invincibility and increased speed at the cost of one ring a second. Collecting the Chaos Emeralds also unlocks a brief post-credits scene that shows a silhouette of Metal Sonic, teasing the events of Sonic the Hedgehog 4: Episode II (2012). Players are also able to upload their game information to online leaderboards to compare level completion times and high scores.

Each version of the game is mostly identical, save for differences in screen size and resolution. For instance, the PlayStation 3, Xbox 360, and Windows versions support high-definition and widescreen displays, whereas the Wii version does not.[2] Additionally, the PlayStation 3 and Wii versions both support their systems' respective motion controllers. The mobile versions can be controlled with either the accelerometers or virtual buttons on the touchscreen. Two levels exclusive to these versions are designed around the use of the accelerometers.[3]


Old-school Sonic fans have long asked to see Sonic return to a more 2D style of gameplay. Many liked the daytime stages in Unleashed but wanted to see a game that plays purely similar to the early games of the Genesis. Project Needlemouse is that critical first step that brings Sonic back to his 2D roots.

Sega's Ken Balough, when asked why Sonic the Hedgehog 4: Episode I was commissioned.[4]

According to project head Takashi Iizuka, Sonic 4 was conceived in January 2009; development began four months later and lasted about a year and a half.[5] Dimps, which had previously developed Sonic platformers for the Game Boy Advance and Nintendo DS, led development,[6] with assistance from Sonic Team.[7] Sonic Team's Toshiyuki Nagahara served as director.[8] The only developers on the team who contributed to the Genesis titles were producer Iizuka and composer Jun Senoue.[7] The game was announced on September 11, 2009 under the working title Project Needlemouse.[9] Its proper title, Sonic the Hedgehog 4: Episode I, was revealed on February 4, 2010, alongside the debut of in-game footage.[10]

Brand manager Ken Balough stated that Sonic 4 was conceived following fan requests for a return to classic Sonic gameplay.[4] He acknowledged the divide between older Sonic fans who played the Genesis games and younger ones who played more recent games like Sonic Unleashed (2008), and said Sega needed to cater to both demographics.[11] In an interview with Nintendo Life, Balough said that "[w]hen we started discussing doing a 2D Sonic game, it just made sense that we would make Sonic 4. It's a game fans have been asking about for years, and we felt we had the right team to make it."[12] While Balough said the game was always called Sonic 4,[12] according to journalist Kurt Kalata, Sonic 4 was not conceived as a mainline, numbered Sonic game, but rather as a smartphone-exclusive spin-off called Sonic the Portable that took advantage of those devices' gyroscope functions.[2] Kalata wrote that it was retitled Sonic 4 at the behest of Sega's American branch and made a multiplatform release, and noted that one of the game's levels still features signs that say Sonic the Portable.[2]

Iizuka noted that after Sonic Adventure was released in 1998, the Sonic series began to have a greater emphasis on speed. However, he also acknowledged many fans still enjoyed the Genesis games, as evidenced from those titles' popularity on digital distribution platforms. With Sonic 4, Iizuka was motivated to return to the classic Sonic style with modern technologies.[7] To stay faithful to the original Genesis games, the developers chose not to include voice acting.[5] The team began development using elements they considered vital to the Sonic series: a simple control scheme—with jumping and attacking controlled by a single button—and level design emphasizing platforming and momentum-based gameplay.[7] To establish Episode I as a successor to the Genesis titles, the developers chose to revive those games' level locales to, as Iizuka explained, "tap into that nostalgia factor. Essentially we wanted people to recognize this was a continuation from the [Genesis] era Sonics."[13] While the content in all versions is mostly the same, two levels in the mobile version were replaced in the console releases.[2] These two levels were supposed to be retained across all releases,[14] but they were designed around the use of a smartphone gyroscope,[2] and the team did not think they translated well to a console.[14]

Sonic the Hedgehog 4: Episode I composer Jun Senoue (center) in 2012

One new addition was Sonic's homing attack from Sonic Adventure; Iizuka said the team "wanted to add that excitement of performing continuous attacks" and felt it "add[ed] to the classic-style gameplay by providing a new means to discover routes in the sky".[7] Though a return to the classic Sonic formula, Sonic the Hedgehog 4: Episode I does not reuse Sonic's original design, instead retaining his post-Adventure design. Iizuka reasoned this was because the game was not a remake.[7] Following the project's announcement, in January 2010 Sega began a countdown with a list that discounted potential playable characters. When fans answered trivia questions, the list got whittled down, and culminated with the reveal that Sonic would be the only playable character.[15][16] Iizuka said this decision was made because the team wanted both old and new fans to be able to enjoy the game.[7] The decision to scale back the series' extensive cast was also identified as a way to return to the series' roots.[2] Despite this, the post-credits scene teases the reintroduction of Metal Sonic, who had not appeared in a Sonic game for years. Balough stated that fans had been asking Sega to bring back Metal Sonic for years,[11] and that the post-credits scene was added to keep players excited for Episode II.[12]

Senoue only composed some tracks for the Genesis Sonic games, but for Sonic 4, he was responsible for creating all the music and sound effects.[7] The music was written to replicate the style of the Genesis Sonic games because, according to Balough, the developers wanted the game to feel "like a genuine extension of the first three Sonic games".[11] Senoue was involved with the project early on, when Iizuka approached him to ask him to compose. Senoue said that he attempted to compose the tracks as if he had been composing them for the Genesis, using as few notes as possible. He did not use any FM sound tapes, although he did unsuccessfully attempt to find an old Genesis development kit. Senoue attempted to compose tracks "with a similar beat or similar tempo" to those from Sonic the Hedgehog and Sonic the Hedgehog 2. Senoue had fun working on Episode I and said his favorite track was the first level's, although Nagahara hated it and tried to persuade Senoue to compose a replacement tune.[8] Eggman's theme in Episode I had originally been composed for Sonic 3D Blast (1996), but went unused in that game.[17]


Episode I was originally scheduled for release in July 2010, a timeframe Sega announced in February 2010.[18] Months before the game's release, a prototype version was made available to users of the Xbox 360's game testing service PartnerNet.[19] Screenshots and footage were leaked and widely distributed across the internet,[20] and PartnerNet had to be temporarily shut down as a result.[19] Though some video game journalists responded favorably to the leaked materials,[20][21] fans reacted negatively.[2][19] In May 2010, Sega announced that Episode I had been delayed to late 2010 in response to both internal and fan feedback;[22] Iizuka later clarified that the delay was done so the developers could replace the mobile-exclusive levels with ones better suited for consoles.[14]

Episode I was released on October 7, 2010, for iOS. Releases for other platforms soon followed: the Wii version was released via WiiWare in North America on October 11 and in Europe on October 15; the PlayStation 3 version was released via PlayStation Network in North America on October 12 and in Europe on October 13; and the Xbox 360 version was released via Xbox Live Arcade on October 13.[23] Other releases included a Windows Phone version on June 15, 2011;[24] a Windows version via Steam on January 19, 2012;[25] an Android version on January 25, 2012;[26] and a BlackBerry Tablet OS version on July 20, 2012.[27] Additionally, both Episode I and Episode II were released for the Android-powered Ouya on July 9, 2013.[28] In April 2016, the iOS version was updated for the first time in three years to modernize it for newer devices. Changes included support for widescreen and Retina displays, more detailed character models, and refined textures. The iOS version was initially split into separate versions for iPhone and iPad; the update discontinued the iPad version and made the iPhone one a "universal" application, meaning it works across all iOS devices.[29] Later in 2016, the Xbox 360 versions of Episode I and Episode II were added to the Xbox One's catalog of backward-compatible titles.[30]


Aggregate score
Metacritic(Wii) 81/100[31]
(PS3) 74/100[32]
(X360) 72/100[33]
(iOS) 70/100[34]
Review scores
GamesRadar+4.5/5 stars[39]
(iOS) 7.5/10[42]
Nintendo Life8/10 stars[44]
Nintendo World Report8/10[45]
Digital Spy3/5 stars[47]

Sonic the Hedgehog 4: Episode I received generally positive reviews, according to review aggregator Metacritic.[31][33][32][34] IGN's Hilary Goldstein gave the game a score of 8.0 and an Editor's Choice award, calling it "short but sweet and well worth downloading."[41] GamesRadar+'s Justin Towell gave it a score of 9/10, calling it "deserving of the name, Sonic the Hedgehog 4."[39]'s Kat Bailey gave it a B rank, praising the game's speed while criticizing some occasional poor design, such as boss battles and puzzles.[35] GameTrailers gave it a 7.5, calling it a worthy investment for Sonic fans.[40] Digital Spy gave it three out of five stars, with reviewer Liam Martin answering the question of whether or not it lived up to its hype: "Despite some issues with the size of the game and its difficulty (it's very easy), the answer is yes, but only just."[47] Eurogamer's Ellie Gibson gave it a 9/10, calling it "gloriously fun" and "brilliantly paced."[1]

Criticism of the game focused on poor physics and lack of momentum; both aspects were often cited as being inferior to the momentum-based physics from the 16-bit Genesis games.[48][49] The game sold over a million copies across all platforms by 2011, according to Sega of America CEO Mike Hayes.[50]


Episode I was envisioned as the first installment of an episodic video game trilogy.[51] Shortly before Episode I's release, Balough confirmed that Sega had planned the entire Sonic 4 story. While he did not confirm the number of episodes, he said "[they] will definitely make up a larger game. After completing them all, you'll have experienced a larger overall story arc that lives up to the epic nature of earlier Sonics."[12] In August 2011, Iizuka stated that Episode II would not be released until 2012 (over a year after Episode I) so Sonic Team could focus on Sonic Generations.[52] Ahead of Episode II, Sega rereleased Sonic CD (1993) for modern consoles, and advertised it as a prequel to Sonic 4.[53]

Episode II, released in May 2012, reintroduces Tails and Metal Sonic,[54] and follows Sonic and Tails as they attempt to prevent Eggman and Metal Sonic from relaunching the Death Egg.[55] Fan input from Episode I played a significant role in the development of Episode II, as the developers worked to address aspects fans took issue with, such as the physics engine.[13] Episode II was released on most platforms that Episode I was available on,[2] although the Wii version was canceled due to hardware constraints.[13] Players who own both episodes on a single platform unlock the ability to play as Metal Sonic in Episode I's levels.[2]

In March 2012, Iizuka announced that Sega did not plan to continue Sonic 4 beyond Episode II.[56] In 2015, Australian developer Christian Whitehead said that he had been offered the opportunity to develop Episode III with Sega Studios Australia before that division was shut down, and he instead worked on remasters of Sonic the Hedgehog and Sonic the Hedgehog 2 between 2012 and 2013. He said that while it was possible that Episode III could eventually be made, it was unlikely.[57] Whitehead would go on to lead the development of Sonic Mania (2017), which, like Sonic 4, acts as a sequel to the Genesis Sonic games. Sonic 4 and Sonic Mania were frequently compared, with journalists viewing Sonic 4 unfavorably in contrast to Mania.[58][59]


  1. ^ Japanese: ソニック・ザ・ヘッジホッグ4 (フォー) エピソードI (ワン) Hepburn: Sonikku za Hejjihoggu Fō: Episōdo Wan
  2. ^ Splash Hill and Lost Labyrinth are based on Green Hill and Labyrinth from Sonic the Hedgehog, while Casino Street and Mad Gear are based on Casino Night and Metropolis from Sonic the Hedgehog 2.


  1. ^ a b c Gibson, Ellie (October 12, 2010). "Sonic the Hedgehog 4: Episode I Review". Eurogamer. Retrieved August 26, 2013. In 2016, Gibson acknowledged that "9/10 was a bit of a stretch." See Gibson, Ellie (August 6, 2016). "Sonic boom: Ellie Gibson on nostalgia, novelty, and that 9/10". Eurogamer. Retrieved August 7, 2016.
  2. ^ a b c d e f g h i Kalata, Kurt (July 12, 2018). "Sonic the Hedgehog 4". Hardcore Gaming 101. Retrieved April 13, 2020.
  3. ^ Hoadapp, Eli (June 15, 2010). "E3 2010: Hands-On with Sega's 'Sonic 4'". TouchArcade. Retrieved June 21, 2011.
  4. ^ a b GameSpot staff (February 4, 2010). "Sonic the Hedgehog Q&A". GameSpot. Retrieved October 26, 2017.
  5. ^ a b Oliver, Tristan (August 11, 2010). "An Interview with Takashi Iizuka". TSSZ News. Archived from the original on August 14, 2010. Retrieved October 26, 2017.
  6. ^ Ronaghan, Neal (February 17, 2010). "Sonic the Hedgehog 4 to be Developed by Dimps". Nintendo World Report. Retrieved March 31, 2018.
  7. ^ a b c d e f g h T., Steve (April 2010). "True Blue". Nintendo Power. Future US (253): 14–17.
  8. ^ a b "Interview with Jun Senoue". Nintendo Power. Future US (258). September 2010.
  9. ^ Thorsen, Tor (September 11, 2009). "All-new 2D Sonic rolling out in 2010". GameSpot. Retrieved October 26, 2017.
  10. ^ Sinclair, Brendan (February 4, 2010). "Sonic the Hedgehog 4 goes episodic this summer". GameSpot. Retrieved February 4, 2010.
  11. ^ a b c Pigna, Kris (Spring 2010). "Back from the Second Dimension". Electronic Gaming Monthly. EGM Media, LLC (238): 56–61.
  12. ^ a b c d Newton, James (October 5, 2010). "Interviews: Sega - Sonic the Hedgehog 4: Episode 1". Nintendo Life. Retrieved April 13, 2020.
  13. ^ a b c Yin-Poole, Wesley (March 13, 2012). "Sonic 4 Episode 2's new physics based on Mega Drive games". Eurogamer. Retrieved April 17, 2020.
  14. ^ a b c Robinson, Andy (September 13, 2010). "iPhone delayed Sonic 4 - Sega". Computer and Video Games. Archived from the original on June 30, 2012. Retrieved April 13, 2020.
  15. ^ Sterling, Jim (January 11, 2010). "Project Needlemouse teased with sinister character list". Destructoid. Retrieved April 13, 2020.
  16. ^ Sterling, Jim (January 15, 2010). "Sonic's the only playable Project Needlemouse character". Destructoid. Retrieved April 13, 2020.
  17. ^ Sterling, Jim (April 6, 2010). "Sonic 4's Eggman theme is from Sonic 3D Blast?". Destructoid. Archived from the original on June 23, 2018. Retrieved February 3, 2018.
  18. ^ Sterling, Jim (February 5, 2010). "Sonic 4 scheduled for July, planned for iPhone". Destructoid. Retrieved April 13, 2020.
  19. ^ a b c Oxford, Nadia (March 2, 2016). "Yakuza 6's Demo Glitch is Another Mishap in Sega's History of Leaks". USgamer. Gamer Network. Retrieved March 31, 2018.
  20. ^ a b Sterling, Jim (February 23, 2010). "Rumor: Leaked Sonic 4 images show old school Robotnik". Destructoid. Enthusiast Gaming. Retrieved March 31, 2018.
  21. ^ Cullen, Johnny (February 24, 2010). "Leaked Sonic 4 shots are verified awesome". VG24/7. Retrieved March 31, 2018.
  22. ^ Good, Owen (May 20, 2010). "Sega's Big Sonic 4 News: It's Delayed". Kotaku. Retrieved April 13, 2020.
  23. ^ Cullen, Johnny (September 28, 2010). "Sonic 4 dated for October". VG247. Retrieved April 13, 2020.
  24. ^ Nunneley, Stephany (May 18, 2011). "Angry Birds and other popular games coming to Windows Phone 7". VG247. Retrieved April 14, 2020.
  25. ^ Bedford, John (January 19, 2012). "Sonic games, DLC release on PC today". Eurogamer. Retrieved April 14, 2020.
  26. ^ Souppouris, Aaron (January 26, 2012). "Sonic the Hedgehog 4 Episode I now available for Android, ICS users report issues". The Verge. Retrieved April 14, 2020.
  27. ^ Edward@Sega (July 20, 2012). "Sonic 4 Episode I: Welcome to Blackberry Playbook!". Sega Blog. Archived from the original on August 13, 2012. Retrieved April 14, 2020.
  28. ^ Usher, Anthony (July 9, 2013). "Sonic spin dashes onto Ouya in Sonic The Hedgehog 4: Episodes I and II". Pocket Gamer. Retrieved April 14, 2020.
  29. ^ Nelson, Jared (April 4, 2016). "First 'Sonic 4 Episode 1' Update in More than 3 Years Improves Visuals , Adds Universal Support, and Fixes Compatibility Issues". TouchArcade. Retrieved April 14, 2020.
  30. ^ Matulef, Jeffrey (November 1, 2016). "Sonic 4 is now backwards compatible on Xbox One". Eurogamer. Retrieved April 14, 2020.
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  32. ^ a b "Sonic the Hedgehog 4: Episode I for PlayStation 3 Reviews". Metacritic. CBS Interactive. Retrieved November 30, 2010.
  33. ^ a b "Sonic the Hedgehog 4: Episode I for Xbox 360 Reviews". Metacritic. CBS Interactive. Retrieved November 30, 2010.
  34. ^ a b "Sonic the Hedgehog 4: Episode 1 for iPhone/iPad Reviews". Metacritic. CBS Interactive. Retrieved July 4, 2013.
  35. ^ a b Bailey, Kat (October 11, 2010). "Sonic 4: Episode I Review". Archived from the original on October 18, 2012. Retrieved November 19, 2014.
  36. ^ Morse, Blake (October 20, 2010). "Sonic the Hedgehog 4: Episode I Review". Game Revolution. Retrieved August 26, 2013.
  37. ^ GamesMaster, issue 232, page 88
  38. ^ Petit, Carolyn (October 15, 2010). "Sonic the Hedgehog 4: Episode I Review". GameSpot. Archived from the original on April 7, 2012. Retrieved August 26, 2013.
  39. ^ a b Towell, Justin (October 8, 2010). "Sonic the Hedgehog 4: Episode I Review". GamesRadar. Retrieved June 21, 2011.
  40. ^ a b "Sonic The Hedgehog 4: Episode 1 Video Game, Review Pod". GameTrailers. October 15, 2010. Retrieved June 21, 2011.
  41. ^ a b Goldstein, Hilary (October 8, 2010). "Sonic the Hedgehog 4: Episode I Review". IGN. Archived from the original on July 13, 2011. Retrieved June 21, 2011.
  42. ^ Buchanan, Levi (October 8, 2010). "Sonic the Hedgehog 4: Episode I iPhone Review". IGN. Retrieved August 26, 2013.
  43. ^ Nintendo Gamer, issue 56, page 74
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  45. ^
  46. ^ Sonic The Hedgehog 4: Episode 1 Wii review, Official Nintendo Magazine
  47. ^ a b Martin, Liam (October 13, 2010). "'Sonic The Hedgehog 4: Episode I' (XBLA)". Digital Spy. Retrieved October 17, 2010.
  48. ^ Mix, John (October 14, 2010). "Review: Wonky Physics, Nasty Levels Ruin Sonic the Hedgehog 4". Retrieved March 27, 2012.
  49. ^ Sterling, Jim (September 29, 2011). "Sonic Team justifies Sonic 4's notorious physics". Destructoid. Retrieved June 20, 2013.
  50. ^ Cullen, Johnny (August 11, 2011). "Sonic 4: Episode 2 info coming "very soon," says Sega West boss". VG247. Retrieved June 30, 2013.
  51. ^ Claiborn, Samuel (January 13, 2020). "Sonic the Hedgehog: A History of SEGA's Mascot in Games, Movies, and More". IGN. Retrieved April 17, 2020.
  52. ^ Robinson, Martin (August 23, 2011). "Sonic 4 Episode 2 release date for 2012". Eurogamer. Retrieved April 17, 2020.
  53. ^ DeVries, Jack (January 5, 2012). "Sonic CD Review". IGN. Retrieved April 17, 2020.
  54. ^ M. Thomas, Lucas (May 18, 2012). "Sonic the Hedgehog 4: Episode II Review". IGN. Retrieved April 17, 2020.
  55. ^ Rose, Mike (May 21, 2012). "Sonic the Hedgehog 4: Episode II Review". Gamezebo. Retrieved April 17, 2020.
  56. ^ Batchelor, James (March 23, 2012). "Future Sonic 4 episodes canned". MCV/Develop. Retrieved March 27, 2012.
  57. ^ Whitehead, Christian [@The Taxman] (January 5, 2015) I've always assumed Sonic 4 Episode 3 fizzled out as things evolved with SOA, Sega Networks & F2P etc. I guess it's been long enough that it's not relevant any more, but I was briefly asked if I would be interested in collaborating with Sega Studios Australia (Who did the Castle of Illusion remake) as a potential dev team to work on the third one. Sadly though, SSA were shut down, and Stealth and I worked on the Sonic 1 & 2 remasters in late 2012-2013. Of course, you never know, Sonic Team could one day decide Ep3 should happen, but Ken pretty much confirms my personal thoughts (forum post) – via Sonic Retro. Accessed April 17, 2020.
  58. ^ Linneman, John (July 26, 2016). "Is Sonic Mania the sequel we've waited decades for?". Eurogamer. Retrieved April 17, 2020.
  59. ^ Nelson, Jared (August 15, 2017). "'Sonic Mania' First Impressions – The True 'Sonic 4' Has Arrived, and I'm Begging You Sega, I Need It On Mobile". TouchArcade. Retrieved April 17, 2020.

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