Sonic the Hedgehog 2
|Sonic the Hedgehog 2|
Sega Technical Institute
|Series||Sonic the Hedgehog|
|Mode(s)||Single player, multiplayer|
Sonic the Hedgehog 2 (Japanese: ソニック・ザ・ヘッジホッグ2 Hepburn: Sonikku za Hejjihoggu Tsū?) is a platform video game developed by Sonic Team and Sega Technical Institute, and published by Sega for the Sega Mega Drive/Genesis console. It was released in Japan on November 21, 1992 and in North American and European markets on November 24 the same year. The game is the second main entry in the Sonic the Hedgehog series, and the first to feature Miles "Tails" Prower, a flying two-tailed fox. He and protagonist Sonic the Hedgehog must stop the series antagonist Dr. Ivo Robotnik from stealing the Chaos Emeralds in order to power his space station, called the Death Egg.
Development of the game began in November 1991, two months later than originally intended, because Sega of America felt that it was too soon for a sequel. Both American and Japanese Sonic Team staff contributed to development; art director Tim Skelly designed the appearance of the game's new 3D special stages, based on an earlier tech demo created by Yuji Naka. The staff increased the speed of Sonic the Hedgehog 2 in comparison to its predecessor. As with the original game, the soundtrack was composed by Masato Nakamura.
Sonic the Hedgehog 2 was a critical and commercial success. It has sold over six million copies, making it the second-best-selling Genesis game behind the original Sonic the Hedgehog. It has since been released in several compilations and downloads for various platforms, which were also generally positively received. A remastered version was released on iOS and Android devices in December 2013, including new features such as Boss Rush and Time Attack modes, and the 'Hidden Palace Zone', which was scrapped from the original 1992 release. Two sequels, Sonic the Hedgehog 3 and Sonic & Knuckles, were released in 1994.
The game's two protagonists are Sonic the Hedgehog and his sidekick, Miles "Tails" Prower; Tails is described as having idolized Sonic as a child and wanting to keep up with him. The game's premise is similar to that of the original Sonic the Hedgehog: Sonic's nemesis Dr. Ivo Robotnik is planning world domination with his army of robots, which he has placed animals inside, and the power of the seven Chaos Emeralds. However, this time he is constructing an armored space station known as the Death Egg. The goal of the game is to defeat Robotnik, optionally saving as many animals as possible and collecting all seven Emeralds. By default, the game ends with Sonic riding on Tails' biplane, the Tornado. However, if the player has collected all of the Chaos Emeralds, Sonic, in his Super Sonic form, flies alongside it.
Sonic the Hedgehog 2 is a 2D, side-scrolling platform game. At the game's start, the player can select to either play as Sonic, Tails, or both. In the latter mode, players control Sonic while Tails runs along beside him. A second player can join in at any time and control Tails separately. The game takes place over a series of levels, each divided into one, two, or three acts with a boss fight with Robotnik at the end of the last act. The character can jump on enemies to defeat them; the game also introduces a new move, the "spin dash" or "Super Dash Attack", by which the player curls in a ball and spins while stationary, resulting in a speed boost. When the player is attacked by an enemy without rings, is crushed, falls off-screen, or exceeds the act's ten-minute limit, they lose a life and return to the most recently passed checkpoint. Dying with zero lives gives the player a game over.
When the player collects at least 50 rings and passes a checkpoint, they can warp to a "special stage". In these stages, the player runs through a pseudo-3D half-pipe course, collecting rings and dodging bombs. A set amount of rings must be collected to pass through each of three checkpoints and in turn to obtain the emerald itself. If Sonic collides with a bomb, he loses ten rings and is immobilized momentarily. The stages rise in difficulty, and the player cannot enter any stage without passing the previous one. After finishing, the player is transported back to the star post they used to enter the special stage. When all Emeralds have been collected, if the player chose Sonic, he has the ability to turn into Super Sonic, which requires 50 rings or more. Super Sonic is yellow and invincible to enemy attacks, and his speed, acceleration, and jump height are increased as well. However, he loses one ring per second and reverts to being regular Sonic when all of his rings are gone.
The game also has a competitive mode, where two players compete against each other to the finish line, as either Sonic or Tails, in a split-screen race through three of the regular levels and a special stage. After one player finishes one of the regular levels, the other player must finish the zone within 60 seconds, or the level ends instantly. In the regular levels, players are ranked in five areas (score, time, rings held at the end of the level, total rings collected, and number of item boxes broken). The player with wins in the most number of categories, wins the level. In the Special Stage, players compete to obtain the most rings. The mode ends when all stages have been completed, or if a player loses all their lives, in which their opponent will automatically win.
Connection to Sonic & Knuckles
Two years after the 1992 release of Sonic 2, Sonic & Knuckles was released in 1994. Sonic & Knuckles possessed a special "lock-on" cartridge, in which the player would put the Sonic & Knuckles cartridge into the Genesis, followed by a second game into the top of it. This unlocks Knuckles the Echidna in Sonic the Hedgehog 2, a variation of Sonic 2 where the player instead plays as Knuckles the Echidna, a character who was not introduced until 1994's Sonic the Hedgehog 3 and was not playable until Sonic & Knuckles later that year.
The game is largely identical to Sonic the Hedgehog 2, with the exception that gameplay is altered due to Knuckles having separate abilities from Sonic or Tails. Knuckles can glide and climb walls, which allows him to gain access to areas that had been otherwise hidden or unreachable. Conversely, he cannot jump as high, making some situations, such as certain boss fights, more difficult. However, in this version of the game, the two player mode has been removed. The special stages are the same, though the amount of rings needed to progress has been decreased, and the score made within the stage no longer resets.
Following the release of the original Sonic the Hedgehog, creator Yuji Naka quit Sega due to disagreements over corporate policies. Mark Cerny, who had recently founded the Sega Technical Institute (STI) at Sega of America, met with Naka in Japan and offered him a higher salary and more creative freedom if he joined STI. Naka agreed, and Hirokazu Yasuhara, lead level designer of Sonic the Hedgehog, also decided to move to STI. Yasuhara had been assigned to help Cerny establish STI in 1990, but the outbreak of the Gulf War delayed his move to the United States by three months, during which he joined Sonic Team and became part of the Sonic project.
Development of Sonic 2 began in November 1991, two months later than Cerny had intended, because Sega of America initially felt it was too soon for a sequel. Both American and Japanese Sonic Team staff contributed to development; art director Tim Skelly designed the appearance of the game's pseudo-3D special stages, based on a tech demo created by Naka. Sonic 2 also introduced Sonic's sidekick, a two-tailed flying fox named Tails, inspired by Japanese folklore about the kitsune and created by level artist Yasushi Yamaguchi. Sega of America objected to the character's name, Miles Prower (a pun on "miles per hour"), so he was given the nickname Tails as a compromise. Masaharu Yoshii served as the game's director. The staff increased the speed of Sonic the Hedgehog 2 compared to the first game.
The game was originally believed to contain time travel elements and also have a port to the Mega-CD/Sega CD, Sega's add-on for the Genesis. The port never surfaced, and time travel was instead implemented in an original Sonic game for the Mega CD, Sonic the Hedgehog CD.
A demonstration cartridge of the game was stolen at a New York toy show earlier in 1992. Sega's Akinori Nishiyama stated that the leak was due to the lack of security. The prototype features a playable section of a level titled "Hidden Palace Zone", a level cut shortly before release. Naka said of the level:
The basic idea was about the same as it was in Sonic & Knuckles. You'd encounter the stage through normal play by collecting the emeralds. The idea behind the stage was, "Where do the Chaos Emeralds come from?" That's where Sonic was originally supposed to be granted his Super Sonic powers. We finally were able to use it in S&K, though it wound up being quite different from what we had planned in Sonic 2. But even from Sonic 1 we'd been throwing around those sorts of ideas. Still, when we were running out of time, we looked over things quickly trying to figure out what to dump ... and CHOP went the Hidden Palace. There's simply no way we could have thrown that in by the deadline at the rate we were going.
The "Hidden Palace" level was lost for over 20 years until it was included in the iOS remaster release in December 2013, which implemented the level. Sega provided some magazines, such as GamePro, with screenshots of early builds of the game that showed another removed level; a desert themed level, named "Dust Hill Zone". Naka has also alluded to another, unidentified, scrapped level in the Sonic Jam Official Strategy Guide, explaining why the "Metropolis Zone" had three parts to it, while every other level only had two: "Due to problems with the story, Act 3 was going to be a different Zone that would only appear once, but since it was cut, we still wanted to have something after Act 2. So that's why there are three acts in this one. We had already finished the map, and it would have been a shame to waste it, so this is what we went with."
|Sonic the Hedgehog 1 & 2 Soundtrack|
|Soundtrack album by Masato Nakamura|
|Released||October 19, 2011 (Japan)|
|Genre||Video game soundtrack|
Disc One: 01:07:51
Disc Two: 01:05:15
Disc Three: 00:19:26
Sonic the Hedgehog 2's music was, like to that of its predecessor, composed by Masato Nakamura, bassist and songwriter of the J-pop band Dreams Come True. The music development began early on in development with only concept images for Masato's reference but having a previous game meant he had experience in this type of music production already and taking a similar approach to the first game, Masato treated Sonic the Hedgehog 2 as film and designed the music around the atmosphere that he felt from the images of the stages. Except for the graphics and some discussion with Sonic Team, Masato was given freedom over the music creation which he believes was the reason why he was able to create "such melodic tunes and unusual rhythm patterns".
Masato created the music while he was recording with Dreams Come True in London, working on their fourth album The Swinging Star. As a gift to Sonic Team, Masato produced an alternate version of the ending theme with Dreams Come True, which was included in the album they were recording at the time. In 2011, the stage music from the Chemical Plant and Casino Night zones was remixed by Wave Master, Sega's in-house audio development department for use in Sonic Generations.
Later in October of the same year, a three-disc compilation of music from Sonic the Hedgehog and Sonic the Hedgehog 2 was released in Japan. Alongside music from the game, the compilation includes comments by Yuji Naka and an interview with Nakamura. The first disc contains original tracks from both games, and the second contains Masato Nakamura's demo recordings produced during the games' development. The third disc contains "Sweet Sweet Sweet" by Dreams Come True, its English-language version "Sweet Dream", and 2006 remixes of both songs by singer Akon which were used in Sonic the Hedgehog (2006).
|1.||"STH1 Green Hill Zone 〜Mega Drive version〜"||2:38|
|2.||"STH1 Marble Zone 〜Mega Drive version〜"||2:08|
|3.||"STH1 Spring Yard Zone 〜Mega Drive version〜"||2:10|
|4.||"STH1 Labyrinth Zone 〜Mega Drive version〜"||2:08|
|5.||"STH1 Star Light Zone 〜Mega Drive version〜"||2:26|
|6.||"STH1 Scrap Brain Zone 〜Mega Drive version〜"||2:36|
|7.||"STH1 Final Zone 〜Mega Drive version〜"||1:17|
|8.||"STH1 Special Stage 〜Mega Drive version〜"||1:32|
|9.||"STH1 Power Up 〜Mega Drive version〜"||0:58|
|10.||"STH1 1up 〜Mega Drive version〜"||0:06|
|11.||"STH1 Title 〜Mega Drive version〜"||0:11|
|12.||"STH1 All Clear 〜Mega Drive version〜"||0:20|
|13.||"STH1 Stage Clear 〜Mega Drive version〜"||0:09|
|14.||"STH1 Boss 〜Mega Drive version〜"||1:23|
|15.||"STH1 Game Over 〜Mega Drive version〜"||0:15|
|16.||"STH1 Continue 〜Mega Drive version〜"||0:12|
|17.||"STH1 Staff Roll 〜Mega Drive version〜"||2:03|
|18.||"STH2 Emerald Hill Zone 〜Mega Drive version〜"||2:26|
|19.||"STH2 Chemical Plant Zone 〜Mega Drive version〜"||2:10|
|20.||"STH2 Aquatic Ruin Zone 〜Mega Drive version〜"||1:40|
|21.||"STH2 Casino Night Zone 〜Mega Drive version〜"||2:18|
|22.||"STH2 Hill Top Zone 〜Mega Drive version〜"||1:51|
|23.||"STH2 Mystic Cave Zone 〜Mega Drive version〜"||2:07|
|24.||"STH2 Oil Ocean Zone 〜Mega Drive version〜"||1:55|
|25.||"STH2 Metropolis Zone 〜Mega Drive version〜"||1:49|
|26.||"STH2 Mystic Cave Zone (2P) 〜Mega Drive version〜"||2:05|
|27.||"STH2 Casino Night Zone (2P) 〜Mega Drive version〜"||1:55|
|28.||"STH2 Death Egg Zone (Part1) 〜Mega Drive version〜"||2:10|
|29.||"STH2 Death Egg Zone (Part2) 〜Mega Drive version〜"||2:18|
|30.||"STH2 Emerald Hill Zone (2P) 〜Mega Drive version〜"||1:35|
|31.||"STH2 Sky Chase Zone 〜Mega Drive version〜"||1:38|
|32.||"STH2 Wing Fortress Zone 〜Mega Drive version〜"||1:59|
|33.||"STH2 Special Stage 〜Mega Drive version〜"||1:47|
|34.||"STH2 Power Up 〜Mega Drive version〜"||0:54|
|35.||"STH2 Title 〜Mega Drive version〜"||0:12|
|36.||"STH2 All Clear 〜Mega Drive version〜"||1:16|
|37.||"STH2 Boss 〜Mega Drive version〜"||2:14|
|38.||"STH2 Super Sonic 〜Mega Drive version〜"||1:16|
|39.||"STH2 Option 〜Mega Drive version〜"||0:42|
|40.||"STH2 Staff Roll 〜Mega Drive version〜"||2:41|
|41.||"STH2 Game Results 〜Mega Drive version〜"||2:19|
|42.||"STH2 Unused Song 〜Mega Drive version〜"||2:02|
|1.||"STH1 Green Hill Zone 〜Masa's Demo version〜"||2:37|
|2.||"STH1 Marble Zone 〜Masa's Demo version〜"||2:14|
|3.||"STH1 Spring Yard Zone 〜Masa's Demo version〜"||2:16|
|4.||"STH1 Labyrinth Zone 〜Masa's Demo version〜"||2:08|
|5.||"STH1 Star Light Zone 〜Masa's Demo version〜"||2:30|
|6.||"STH1 Scrap Brain Zone 〜Masa's Demo version〜"||2:41|
|7.||"STH1 Final Zone 〜Masa's Demo version〜"||1:24|
|8.||"STH1 Special Stage 〜Masa's Demo version〜"||1:32|
|9.||"STH1 1up 〜Masa's Demo version〜"||0:07|
|10.||"STH1 Title 〜Masa's Demo version〜"||0:12|
|11.||"STH1 All Clear 〜Masa's Demo version〜"||0:24|
|12.||"STH1 Stage Clear 〜Masa's Demo version〜"||0:11|
|13.||"STH1 Boss 〜Masa's Demo version〜"||1:29|
|14.||"STH1 Game Over 〜Masa's Demo version〜"||0:22|
|15.||"STH1 Continue 〜Masa's Demo version〜"||0:13|
|16.||"STH2 Emerald Hill Zone 〜Masa's Demo version〜"||2:48|
|17.||"STH2 Chemical Plant Zone 〜Masa's Demo version〜"||2:29|
|18.||"STH2 Aquatic Ruin Zone 〜Masa's Demo version〜"||2:03|
|19.||"STH2 Casino Night Zone 〜Masa's Demo version〜"||2:23|
|20.||"STH2 Hill Top Zone 〜Masa's Demo version〜"||2:12|
|21.||"STH2 Mystic Cave Zone 〜Masa's Demo version〜"||2:26|
|22.||"STH2 Oil Ocean Zone 〜Masa's Demo version〜"||2:06|
|23.||"STH2 Metropolis Zone 〜Masa's Demo version〜"||2:21|
|24.||"STH2 Mystic Cave Zone (2P) 〜Masa's Demo version〜"||2:02|
|25.||"STH2 Casino Night Zone (2P) 〜Masa's Demo version〜"||2:03|
|26.||"STH2 Death Egg Zone (Part1) 〜Masa's Demo version〜"||2:18|
|27.||"STH2 Death Egg Zone (Part2) 〜Masa's Demo version〜"||2:22|
|28.||"STH2 Emerald Hill Zone (2P) 〜Masa's Demo version〜"||1:45|
|29.||"STH2 Sky Chase Zone 〜Masa's Demo version〜"||1:49|
|30.||"STH2 Wing Fortress Zone 〜Masa's Demo version〜"||2:08|
|31.||"STH2 Special Stage 〜Masa's Demo version〜"||2:04|
|32.||"STH2 All Clear 〜Masa's Demo version〜"||1:23|
|33.||"STH2 Boss 〜Masa's Demo version〜"||2:16|
|34.||"STH2 Super Sonic 〜Masa's Demo version〜"||1:21|
|35.||"STH2 Option 〜Masa's Demo version〜"||0:40|
|36.||"STH2 Game Results 〜Masa's Demo version〜"||2:19|
|37.||"STH2 Unused Song 〜Masa's Demo version〜"||1:03|
|38.||"Theme of SONIC THE HEDGEHOG Demo"||0:34|
|1.||"SWEET SWEET SWEET"||5:15|
|3.||"SWEET SWEET SWEET -06 AKON MIX-"||4:41|
|4.||"SWEET DREAM -06 AKON MIX-"||4:16|
Sega launched a $10 million advertising campaign for Sonic the Hedgehog 2's release. It was first released in Japan on November 21, 1992. The Genesis release in North America and the Mega Drive release in Europe both came on November 24, 1992, a Tuesday, and the release day was promoted as "Sonic 2s day". 400,000 copies of Sonic 2 were sold in the first seven days after release, and over 6 million in the life span of the console.
Alternate versions and ports
A version of the game for the Sega Master System and Game Gear was developed by Aspect. Though based on the original game of the same name, it is a distinct game, with different level designs and a different plot, and this version, unlike the 16-bit release, does not have the spindash, which led it to being thought to be made before the Sega Genesis version.
Compilations that include the game are Sonic Compilation (1995) for the Sega Mega Drive/Genesis; Sonic Jam (1997) for the Sega Saturn; Sonic Mega Collection (2002) for the Nintendo GameCube; Sonic Mega Collection Plus (2004) for the PlayStation 2, Xbox, and PC; Sega Genesis Collection (2006) for the PlayStation 2 and PlayStation Portable; Sonic's Ultimate Genesis Collection (2009) for the Xbox 360 and PlayStation 3; and Sonic Classic Collection (2010) for the Nintendo DS.
The game was made available for download on Wii's Virtual Console on June 11, 2007, PlayStation 3 via the PlayStation Network on April 19, 2011, and Xbox 360 via Xbox Live Arcade, the latter having enhancements such as online leaderboards, achievements, and online play. Various mobile phone versions exist as well, including the iOS release. A remastered version of the game, made using Christian Whitehead's "Retro Engine", was released for iOS, Android and Windows Phone devices on December 12, 2013, featuring Knuckles as a playable character, a boss attack mode, online multiplayer, additional multiplayer stages, and the previously unreleased Hidden Palace Zone. The game will be released as part of the Nintendo 3DS 3D Classics line, worldwide in September 2015.
Due to the popularity of its predecessor, Sonic the Hedgehog 2 already had an established fanbase anticipating its release. The game received critical acclaim upon release and was a best seller in the UK charts for 2 months. As of 2006, the game has sold over 6 million copies, making it the second best-selling game for the Sega Genesis (after the original Sonic the Hedgehog). The game has an aggregate score of 88.44% from GameRankings, notably higher than its predecessor.
Reviewers praised the game for its large levels, colorful graphics and backgrounds, increased cast of characters, enemies, and music. GameSpot stated that "time may have eroded Sega's prominence, but it hasn't done much to diminish how sweet Sonic the Hedgehog 2 is," and, along with other reviewers, commented on how it is still a fun game to play. Electronic Gaming Monthly awarded it as the best Sega Genesis game of 1992. In 2000, Game Informer ranked Sonic 2 number 61 on its "Top 100 Games of All Time" list, calling it "the most challenging and finely polished Sonic the Hedgehog title." Mega placed the game at #36 in their "Top Sega Mega Drive Games of All Time" list. Critics also enjoyed the faster gameplay the game offered in comparison to its predecessor, as well as its new features. Lucas Thomas of IGN praised the new "Spin-Dash" ability, which would prepare Sonic to launch at a faster speed. Thomas also noted that the levels of Sonic 2 were designed to showcase the character's speed, and was less a "platform-jumping game" than a "platform-running" game, in slight contrast to its predecessor.
The game's main criticisms were of the two player mode, a new introduction to the series. Reviewers criticized the game's noticeable slowdown and prominent flickering, not to mention the squashed play area for each player. However, Lucas Thomas praised the innovation of the new two player mode, quipping that "Mario and Luigi could never run competitively through the same levels, at the same time". Finally, the game only allowed two-player mode in three different zones (Emerald Hill, Casino Night and Mystic Cave). William Burrill of the Toronto Star described the two player racing mode as the "only part of the game that can be faulted," citing that the mode and its split screen view "squeezes the graphics, plumps up the characters and slows down the action."
Sonic the Hedgehog 2 's financial success was a major factor in Sega catching up to Nintendo in the early-1990s console wars. It brought their market share up to 50% within six months of its release. Tails, whom Sonic the Hedgehog 2 introduced, would go on to become one of the most prominent and frequently recurring characters in the series, appearing and acting as Sonic's sidekick in most of the franchise's media, including in recent games such as Sonic Colors, Sonic Generations, and Sonic Lost World in which most of the recurring cast does not appear or is relegated to minor roles. Tails starred alone in two games for the Sega Game Gear: Tails' Skypatrol and Tails Adventure. Furthermore, Sonic the Hedgehog 2 's popularity managed extend its own cult following and spawn various merchandise such as comic books (the well-received fortnightly Sonic the Comic), a television series, and a sequel, Sonic the Hedgehog 3, which received similar acclaim.
For Sonic's twentieth anniversary, Sega released Sonic Generations, a game that remade aspects of various past games from the franchise. The PlayStation 3, Xbox 360, and PC versions contained a remade "Chemical Plant" level. It also contained a remake of the final boss fight, the Death Egg Robot, as the Classic Era boss of the game. Separately, the Nintendo 3DS version of the game contained a remake of the "Casino Night" level. A "Casino Night" themed pinball minigame was made available for download as a pre-order bonus for the console versions at GameStop.
- ソニック・ザ・ヘッジホッグ2 （マスターシステム版）. Famitsu (in Japanese). Famitsu Japan. Retrieved 2014-11-17.
- Biddle, Frederic M. (1992-12-08). "Sega vs. Nintendo: The Rematch". The Boston Globe: Economy 43.
- Sonic the Hedgehog 2 (Genesis) instruction manual, p. 3.
- Sonic the Hedgehog 2 (Genesis) instruction manual, p. 4.
- Creegan, Dermot. "Casual Monday: Sonic the Hedgehog 2". Hardcore Gamer. Disqus. Retrieved 2014-11-16.
- Lucas M., Thomas (2007). "IGN's Sonic the Hedgehog 2 Review". IGN. Ziff Davis. Retrieved 2007-10-21.
- Sonic the Hedgehog 2 (Genesis) instruction manual, p. 8.
- Sonic the Hedgehog 2 (Genesis) instruction manual, p. 7.
- Sonic the Hedgehog 2 (Genesis) instruction manual, p. 6.
- Sonic the Hedgehog 2 (Genesis) instruction manual, p. 9.
- Sonic the Hedgehog 2 (Genesis) instruction manual, p. 18.
- Nelson, Jared. "A Guide to 'Sonic The Hedgehog' Version 2.0's Hidden Level-select, Debug Mode, and Many More Secrets". TouchArcade. Arnold Kim. Retrieved 2014-11-16.
- Sonic the Hedgehog 2 (Genesis) instruction manual, p. 17.
- Sonic the Hedgehog 2 (Genesis) instruction manual, pp. 19–20.
- Newton, James. "Sonic & Knuckles "lock-on" review". NintendoLife. GamesIndustry.biz. Retrieved 2014-11-14.
- Horowitz, Ken (2007-06-11). "Developer's Den: Sega Technical Institute". Sega-16. Retrieved 2014-07-11.
- "The Essential 50 Part 28 - Sonic the Hedgehog". 1UP.com. Ziff Davis. Archived from the original on 2011-06-22. Retrieved 2014-07-21.
- "Sonic's Architect: GI Interviews Hirokazu Yasuhara". Game Informer 13 (124): 114–116. August 2003.
- Thomason, Steve (January 2007). "Birth of a Hedgehog". Nintendo Power (Future Publishing) 20 (211): 72.
- "G4 Icons Episode #37: Yuji Naka". YouTube. 2013-04-05. Retrieved 2014-07-11. Event occurs at 8:50.
- Harris, Blake J. (2014). Console Wars: Sega, Nintendo, and the Battle That Defined a Generation. New York, New York: HarperCollins. pp. 244–247. ISBN 978-0-06-227669-8.
- Sega Video Game Illustrations. Nippon Shuppan Hanbai (Deutschland) GmbH. 1994. p. 50. ISBN 3-910052-50-9.
- "Mega Mouth". Mega (1): 90. October 1992.
- DeVries, Jack (2011-12-15). "Sonic CD Review". IGN. Ziff Davis. Retrieved 2014-11-17.
- "GameSpy: Sega's Yuji Naka Talks!". GameSpy. Retrieved 2007-02-27.
- "Kikizo Games: Features: Sonic Team Interview November 2005 (Page 2)". Kikizo. Kikizo, Ltd. Retrieved 2007-02-27.
- "GameSpy: Sega's Yuji Naka Talks! - Page 4". GameSpy. Retrieved 2014-01-08.
- Cowan, Danny (2013-12-11). "Remastered Sonic the Hedgehog 2 hits Android, iOS tomorrow with bonus Hidden Palace Zone". Joystiq. AOL. Retrieved 2014-01-08.
- Earth Angel (June 1993). "Sonic Mystery". GamePro (IDG) (47): 14.
- "Backstage with Sonic the Hedgehog 2". Game Players Sega Guide (Sega): 16. December 1992.
- Sonic Jam: Official Guide ソニックジャムオフィシャルガイド (in Japanese). 1997. ISBN 978-4-797-30337-7.
- Nakamura, Masato (2011), Interview with Masato Nakamura (Album Booklet), DCT Records,
When I started writing the music, "Sonic the Hedgehog 1" was just still images..."Sonic the Hedgehog 2" started off the kind of the same. Just graphics.
- Nakamura, Masato (2011), Interview with Masato Nakamura (Album Booklet), DCT Records,
I wanted to treat 'Sonic the Hedgehog' as a film, my inspiration came from each screenshot, or each stage.
- Nakamura, Masato (2011), Interview with Masato Nakamura (Album Booklet), DCT Records,
There were some briefs and meetings...otherwise, they let me do as I pleased, and gave me the freedom to create music.
- Naka, Yuji (2011), Interview with Yuju Naka (Album Booklet), DCT Records,
Nakamura reoworked the ending theme...info a song entitled "SWEET SWEET SWEET" for inclusion on the DREAMS COME TRUE ALBUM
- Newton, James. "Sonic Colours Soundtrack Racing to iTunes". NintendoLife. GamesIndustry.biz. Retrieved 2014-11-14.
- Elston, Brett. "Game music of the day: Sonic the Hedgehog 2". GamesRadar. Future US. Retrieved 2014-11-16.
- Gantayat, Anoop. "TGS 2005: EYES-ON SONIC NEXT-GEN". IGN. Ziff Davis. Retrieved 2014-11-16.
- Good, Owen. "A Look Back at 20 Years of Music History with Sonic". Kotaku. Gawker Media. Retrieved 2014-11-16.
- "POCS-21032~4 | SONIC THE HEDGEHOG 1&2 SOUNDTRACK". VGMdb. Retrieved 2014-01-08.
- "Sonic the Hedgehog 1 & 2 soundtrack - Dreams Come True". Famitsu. Famitsu Japan. Retrieved 2014-11-16.
- Goldfarb, Andrew. "THE GREATEST VIDEO GAME MUSIC 2 TRACKLISTING REVEALED". IGN. Retrieved 27 November 2014.
- Person, Chirs (October 17, 2014). "90s Sonic The Hedgehog CDs Were Pretty Sexual". Kotaku. Retrieved 27 November 2014.
- Thomas, Lucas (2007-06-11). "Sonic the Hedgehog 2 Review". IGN. Retrieved 2014-11-18.
- The Unknown Gamer (October 1992). "Game Gear Preview: 2". GamePro (IDG) (39): p. 114.
- "Sonic 2". Mega Force (Sega) (13). January 1993. Retrieved 2012-02-09.
- "Sonic Classics 3 In 1 (Sonic Compilation)". IGN. Ziff Davis. Retrieved 2014-11-16.
- "Sonic Jam - Saturn". IGN. Ziff Davis. Retrieved 2014-11-16.
- Mirabella, Fran (2002-11-02). "Sonic Mega Collection". IGN. Ziff Davis. Retrieved 2014-11-16.
- Goldstein, Hilary (2004-11-03). "Sonic Mega Collection Plus". IGN. Ziff Davis. Retrieved 2014-11-16.
- Goldstein, Hilary (2006-11-15). "Sega Genesis Collection Review". IGN. Ziff Davis. Retrieved 2014-11-16.
- Miller, Greg (2009-02-12). "Sonic's Ultimate Genesis Collection". IGN. Ziff Davis. Retrieved 2014-11-16.
- Harris, Craig (2010-03-05). "Sonic Classic Collection Review". IGN. Ziff Davis. Retrieved 2013-01-27.
- "Virtual Console Mondays: June 11, 2007". Nintendo World Report. Retrieved 2007-10-21.
- "New PlayStation Plus Content For March & April 2011". PlayStation Blog. Sony. 2011-03-02. Retrieved 2014-01-08.
- "Sonic The Hedgehog 2 - Game Detail Page". Xbox.com. Microsoft. Retrieved 2012-02-18.
- Buchanan, Levi (2010-04-20). "Sonic the Hedgehog 2 iPhone Review". IGN. Ziff Davis. Retrieved 2010-04-28.
- "SEGA’s 3D Classics Return this Summer with SEGA Genesis Games for Nintendo 3DS". SEGA. Retrieved 2015-04-14.
- "Sonic the Hedgehog 2". GameRankings. Retrieved 2012-02-03.
- "Sonic the Hedgehog 2". Metacritic. CBS Interactive. Retrieved 2014-11-27.
- "Sonic the Hedgehog 2 Critic Reviews for iPhone/iPad". Metacritic. CBS Interactive. Retrieved 2014-11-27.
- "Classic Reviews: Sonic the Hedgehog 2". Game Informer 12 (109): 104. May 2002.
- Provo, Frank (2007). "Sonic the Hedgehog 2 Review". GameSpot. Retrieved 2007-10-21.
- East, Tom (2008-01-11). "Sonic The Hedgehog 2: The blue hedgehog returns". Official Nintendo Magazine. Archived from the original on 2013-10-31. Retrieved 2012-02-03.
- "Review: Sonic the Hedgehog 2". Mean Machines (2): 60–3. November 1992. Retrieved 2012-02-03.
- "Game Review: Sonic the Hedgehog 2". Mega (Future Publishing) (2): 36–41. November 1992. Retrieved 2012-02-03.
- "Sonic the Hedgehog 2". Mega Zone (25): 31–33. January 1993.
- "Reviewed: Sonic the Hedgehog 2 (Mega Drive)". Sega Force (Impact Magazines) (12): 14–6. December 1992. Retrieved 2012-02-03.
- "Sonic 2". Sega Force Mega (Impact Magazines) 2 (1): 91. August 1993.
- "Buyer's Guide: Best Game of the Year (Genesis)". Electronic Gaming Monthly. 1993.
Sega's famous mascot -- Sonic the Hedgehog is back for his second visit to the Genesis, and this version is hot! With 8 megabits of memory good ol' Sonic has a lot more room to do cool tricks and this is what makes this version stand head and shoulders above all the other Genesis games that came out this year. All in all, Sonic 2 is the best Genesis cart to come along in a long time!
- "Official Gallup UK Mega Drive Sales Chart". Mega (6). March 1993.
- Boutros, Daniel (2006-08-04). "A Detailed Cross-Examination of Yesterday and Today's Best-Selling Platform Games". Gamasutra. p. 5. Retrieved 2006-12-08.
- "Game Zero's Sonic the Hedgehog 2 Review". Game Zero. 1993.
- "Top 100 Games of All Time". Game Informer 11 (100): 28. August 2001.
- Mega (Maverick Magazines) (26): 74. November 1994. Missing or empty
- Thomas, Lucas (2007-01-26). "Sonic the Hedgehog VC Review". IGN. Retrieved 2014-11-18.
- Dotson, Carter. "Sonic the Hedgehog 2 Gets the Remastering Treatment, With the Long-Lost Hidden Palace Level Restored". 148Apps. Steel Media Ventures. Retrieved 2014-11-18.
- Burrill, William (1992-12-12). "This Sonic is super, too". Toronto Star: F4.
- Claiborn, Samuel. "21 CRAZY FACTS ABOUT SONIC AND THE CONSOLE WAR HE STARTED". IGN. Ziff Davis. Retrieved 2014-11-16.
- "Tails' Sky Patrol - Game Gear". IGN. Ziff Davis. Retrieved 2014-11-16.
- Sleeper, Morgan. "Tails Adventure review". NintendoLife. GamesIndustry.biz. Retrieved 2014-11-16.
- Allan Sugarbaker (24 September 2001). "Interviews: James Wallis". OgreCave.com. Retrieved 22 January 2012.
I teamed up with Carl Sargent and Marc Gascoigne to produce four more Sonic books, novels this time, for Virgin Publishing, under the pseudonym of 'Martin Adams'.
- "FCC 398 Children's Television Programming Report". Licensing.FCC.gov. March 24, 2005. Retrieved 7 July 2012.
- "Sonic the Hedgehog 3". GameRankings. Retrieved 7 February 2012.
- "Sonic Generations overview". IGN. Ziff Davis. Retrieved 2014-11-16.
- Kollar, Phil. "See Sonic's Classic Chemical Plant Zone From Two Perspectives". Game Informer. GameStop. Retrieved 2014-11-16.
- "NYCC 11: Death Egg Robot Boss". GameTrailers. DFY Media. Retrieved 2014-11-16.
- Newton, James. "Sonic Generations Shots Show Casino Night Action". NintendoLife. GamesIndustry.biz. Retrieved 2014-11-16.
- Good, Owen. "Sonic's Casino Night Pinball Comes to PC on Dec. 26". Kotaku. Gawker Media. Retrieved 2014-11-16.
European Club Soccer
|UK number-one Mega Drive game
Ecco the Dolphin