Sonic the Hedgehog series

The Sonic the Hedgehog series is a franchise of video games released by Sega starring their mascot character Sonic the Hedgehog. The series began in 1991 with the release of Sonic the Hedgehog on the Sega Mega Drive/Genesis. An 8-bit version of the game was also released for the Master System and Game Gear formats. Sonic was responsible for turning Sega into a leading video game company during early in the 16-bit era, and his first game soon replaced Altered Beast as the default pack-in game for the Genesis in North America and Europe. As of May 2006, the franchise has sold more than 45 million units, with three more games released in the later half of 2006.

Games in the series are developed by Sonic Team, with the exception of some spinoffs that were independently developed by Sega of America. The main programmer for the first game was Yuji Naka, who would later become head of the Sonic Team division, and the game planner was Hirokazu Yasuhara. The music of the first two Sonic the Hedgehog games on the Mega Drive/Genesis were composed by Masato Nakamura of the Japanese band Dreams Come True.



Overview
Nearly all games in the series feature a teenage hedgehog named "Sonic the Hedgehog" as the central player character and protagonist. The games feature Sonic's attempts to save his planet from various threats, primarily the evil genius Dr. Eggman/Dr. Ivo Robotnik. The main antagonist throughout the series, Robotnik's aim is to rule the planet and establish the Eggman Empire; to achieve this, he usually attempts to eliminate Sonic and acquire the powerful Chaos Emeralds.

History
Most two dimensional Sonic titles are platform games viewed from a side-on perspective. Their controls are fairly basic and do not deviate much from the genre standard; the selling point of the series is the incredible speed of the playable characters, who usually have the ability to run uphill, walls, and even ceilings. Roller coaster-like loops and corkscrews are also common in Sonic games, as are giant pinball machines with flippers and bumpers which knock Sonic around like a ball. The stages are also similar to roller coasters in that many sequences involve Sonic being thrown along pre-set paths with little input from the player, which has led to criticism that the player can complete a Sonic game merely by holding the pad in one direction. However, the games also feature numerous sections involving precise jumping between platforms and avoiding of hazards, although these sections do not require "pixel-perfect" judgement and are perhaps more lenient than most platform games of the era.

The Sega Technical Institute tried to develop a "true" Sonic game for the Saturn called Sonic X-treme. This game was intended to compete with Nintendo's Super Mario 64. However, due to time constraints and issues between STI and the Japanese division of Sega and Sonic Team, the project was cancelled in the last months of 1996.

Sonic 3D: Flickies' Island, an isometric, pseudo-3D ("2.5D") game, was released for the Mega Drive in 1996. Sega Saturn and Windows PC conversions followed to cover the hole of the cancellation of Sonic X-treme. They had enhanced graphics and a different sound track, composed by Richard Jacques. Sonic 3D was developed by Traveller's Tales, although Sonic Team worked on the Special Stages in the Saturn/PC version.

In 1997, a compilation entitled Sonic Jam was released for the Saturn. In addition to containing Sonic the Hedgehog, Sonic 2, Sonic 3 and Sonic & Knuckles, it also included a "Sonic World" mode. This allowed the player to control Sonic in a small 3D world similar to the Green Hill Zone from the original game; it contained no enemies and was mainly a means of accessing the disc's multimedia features such as BGM's, illustrations and even commercials.

Although Sonic R was the first 3D Sonic game, the full leap into 3D platforming was made with Sonic Adventure, a launch title for the Sega Dreamcast console. On June 7, 2001 in North America (23 June in Japan and Europe; the 10th anniversary of the US release of Sonic the Hedgehog), Sonic Adventure 2 was launched. Both of the Adventure titles were later ported to the Nintendo GameCube (under the titles of Sonic Adventure DX: Director's Cut and Sonic Adventure 2: Battle) when Sega dropped out of the hardware market. DX was also ported to Windows PCs.

The first Sonic game to release simultaneously on multiple consoles, Sonic Heroes, was released on the GameCube, Sony PlayStation 2 and Microsoft Xbox in December 2003 in Japan, with American and European releases following soon after, and a PC version the following November. The platforming was largely similar to that of the Adventure titles, although the player now controlled the lead character of a team of three themed characters, with the other two following closely behind (similar to the later Sega Mega Drive games). The player could switch to a new leader at any time, in order to make use of each character's special skills. It sold well, but opinions among both reviewers and fans of the Sonic series were mixed.

Shadow the Hedgehog was no different. Released in the US in November 2005, it received mixed reviews. X-Play, for instance, had given it a 1 out of 5, making it the lowest-scoring Sonic game reviewed on the show. Other game sites such as IGN and GameSpot similarly panned the game. One of the greatest controversies revolving around this game is the gunplay; some fans insisted that Shadow was the self-proclaimed "ultimate life-form" and did not need a weapon. Nintendo Power and Gametrailers, however, both rated it above 8 out of 10. Two other controversies were the over-use of the [curse word "damn" and the fact that Sega had decided to switch to the voice artists from the English version of Sonic X.

A highly faithful two-part port of Sonic the Hedgehog made for mobile phones has been a huge hit in Europe, introducing the game to a new generation of pre-teen gamers, with respected handheld specialist Pocket Gamer awarding Sonic the Hedgehog Part Two a 9 out of 10 review score.

Other gameplay styles
A few Sonic games focus on gameplay styles other than the standard platforming. The first of these was Sonic Spinball (released on the Mega Drive in 1993 and on the Master System and Game Gear in 1994). The concept of Sonic bouncing around as the ball in a giant pinball table had been used in both Sonic the Hedgehog and Sonic the Hedeghog 2; Sonic Spinball made a whole game around that premise.

Several racing games starring Sonic characters have been developed. In Sonic Drift and Sonic Drift 2, characters rode go-karts (kart circuits were later included in the two Sonic Adventure games). In Sonic R (1998), most characters ran on foot (with Eggman riding his Eggmobile and Amy driving a car), while in Sonic Riders (2006), they race on hoverboards. A race mode was also included in Sonic Adventure 2 Battle.

Sonic Shuffle was a Mario Party-style virtual board game/party game for the Sega Dreamcast.

Edutainment videogames starring Sonic and Tails have also been released, such as Sonic the Hedgehog Gameworld and Tails and the Music Maker for the Sega Pico, and the PC title Sonic's Schoolhouse.

A fighting game named Sonic the Fighters existed as an arcade game, and later a fighting/platform game hybrid called Sonic Battle was released for the Game Boy Advance.

In 1993, Dr. Robotnik's Mean Bean Machine was released for the Sega Mega Drive. The game was basically a clone of a Japanese puzzle game named Puyo Puyo. This game was also ported to the Game Gear.

Rings

 * ''See Rings

Giant Rings
Whereas most Rings were small and easily collectible, certain Rings appeared that were much larger. The so-called "Giant Rings" were hidden in the stages and designed to be jumped through, which would transport the character to a Special Stage, where the character could collect one of the Chaos Emeralds or, in certain circumstances, Super Emeralds. They were used for this purpose in the games Sonic the Hedgehog, Sonic CD and Sonic the Hedgehog 3 & Knuckles. Sonic the Hedgehog 2 used Star Posts instead. In Sonic the Hedgehog 3, if all the Emeralds had already been found, these rings could be collected for fifty rings each, allowing the characters to easily tap into the power of the Chaos Emeralds (usually becoming Super, or Hyper in Sonic 3 & Knuckles if the player has collected all the Super Emeralds as well). In most of the newer games since Sonic Adventure 2, these giant rings have taken the place of the old signposts as the end level marker and touching it would end the level.

Chaos Emeralds
The Chaos Emeralds are seven emeralds with mystical powers, and a recurring feature of Sonic games. They are the basic of most of the games' plots, and the player is frequently required to collect them all in order to fully defeat Eggman and achieve the games' "good endings", super forms, or both. The method used to acquire the Emeralds differs between titles in the series. Most early games require the player to find them in Special Stages. In some games, such as Sonic R and the 8-bit versions of Sonic the Hedgehog and Sonic the Hedgehog 2, they can be found in hidden locations within the main levels. In most later games, the Chaos Emeralds are found by the characters throughout the games' story modes, and do not need to be "found" by the player.



Master Emerald
The Master Emerald resides in a shrine on Angel Island and is guarded by Knuckles the Echidna; it contains an unknown amount of power, possibly equal to or greater than all 7 Chaos Emeralds, and is used to keep the Angel Island afloat in the sky. The Emerald also has the power to fully control everything that the Chaos Emeralds do, including the ability to negate the energy of the Chaos Emeralds, as seen in Sonic Adventure and Sonic Adventure 2, or empower them, as seen in Sonic the Hedgehog 3 & Knuckles. The Master Emerald can also be used to power mechanical devices, and has been coveted by Dr Eggman since his discovery of it. During Knuckles' final boss fight in Sonic the Hedgehog 3 & Knuckles, Mecha Sonic powers up using the Master Emerald into a quasi-Super form.

Special Stages
Usually, a Chaos Emerald may be earned in a Special Stage or Special Zone. Special Stages usually take place in surreal environments and feature alternate gameplay mechanics to the standard platforming of the main levels: the 16-bit Sonic the Hedgehog  consisted of a giant rotating maze (which many considered a major technical achievement); Sonic the Hedgehog 2, Sonic 3-D Blast, Sonic Heroes and Sonic Rush featured "in your face" segments with the hedgehog running along a long tunnel, with a variant of this used for Knuckles Chaotix, Sonic Advance, and Sonic Advance 3; 3-D "collect items" levels, as in Sonic 3 and Sonic & Knuckles, which used the same perspective but had Sonic collecting all the blue-coloured orbs on the surface of a giant sphere, and a different version, the 3-D ring-collecting Special Stage, used in Sonic Advance 2. Sonic Chaos (Sonic and Tails in Japan) utilised a variety of gimmicks for its levels.

Some Sonic titles include Special Stages, but not as a means of collecting Chaos Emeralds. As the Emeralds of the 8-bit version of Sonic the Hedgehog were hidden in the main stages, the game's spring-filled Special Stages were merely used as a means of adding variety, and for a player to increase their score. Similarly, Sonic 3 and Sonic & Knuckles, in addition to their main Special Stages, featured entirely optional bonus stages, one of which combined the rotating maze of the 16-bit Sonic the Hedgehog with the pinball gambling of Sonic the Hedgehog 2, and Sonic Heroes had an alternate Special Stage for earning lots of 1-UPS, very much like the one in which Chaos Emerals are collected, but with the objective being to get to the Goal Ring before time ran out, rather than catching up to the Chaos Emerald at the end of the tunnel.

Just as the design of the Special Stages has changed, so has the means of accessing them. In Sonic 3 & Knuckles, giant rings were hidden in levels to take the player to the Stages, but most other titles involve the collection of a certain number of rings, usually 50. In both the 8- and 16-bit versions of Sonic the Hedgehog, they were reached by finishing a level with more than 50 rings; the player would then have to jump inside the giant ring that would appear just after the goal post. In the 16-bit Sonic the Hedgehog 2, reaching a Star Post when they held this number would create a warp of stars which would take a player to the Special Stage when jumped through. Sonic 3D required the player to deliver rings to Knuckles and Tails, who could be found within each level. Sonic Chaos changed the figure, with access to a Special Stage being the reward for collecting 100 rings.

In the more recent game Sonic Heroes, the Special Stages made a return. These special stages were accessed by finding a key in stage 2 of each zone and keeping it (by not taking damage) until the end of the level. It consisted of running through a twisting tube. The Chaos Emerald would be ahead of the characters, and the goal was to "catch up" with it by collecting orbs which refueled a "dash gauge" which the characters would use to speed up and catch it. The stages had some motion glitches which would sometimes cause the characters to slow down dramatically, making it difficult to complete the stage. If the Chaos Emerald got to the end of the stage before the characters caught up with it, the stage would end without the gaining of a Chaos Emerald.

Super Sonic


Since the 16-bit version of Sonic 2, Sonic has had the ability to transform into the extremely fast and nearly invulnerable Super Sonic once all seven Chaos Emeralds are collected. After that, Super Sonic can be used in any of the following levels once 50 rings have been collected, although one ring is lost for every second Sonic remains in this form.

In the Sonic Adventure titles, the Special Stages were omitted entirely and Chaos Emeralds were collected in non-interactive cut-scenes as part of the story, with Super Sonic only appearing in the climactic final boss fights. This dismayed many fans, who appreciated the additional replay value offered by retrying a game's levels with Super Sonic's additional abilities. Despite several games since returning to the emerald-collecting of the 2D platform titles (including the Advance series, Heroes, and Rush), Super Sonic was again only playable at the end of the game in an extra zone.

In Sonic Riders, Super Sonic is also an unlockable character, playable outside the final level for the first time since the Sega Genesis games. As with previous games, Super Sonic consumes rings as long as the form is sustained, and Sonic reverts to standard Sonic when he runs out of rings. He is playable by unlocking the "Chaos Emerald" gear.

Other characters have also been able to utilize the Super transformation. In Sonic & Knuckles, Knuckles the Echidna could also transform into Super Knuckles. By locking-on Sonic 3 to Sonic & Knuckles, Hyper Sonic, Super Tails and Hyper Knuckles also become available, by collecting all 7 Super Emeralds in addition to the 7 Chaos Emeralds. In Sonic Adventure 2, Super Shadow also appeared at the end of the Last story, who fought alongside Super Sonic to destroy the Biolizard. In Sonic Rush, Burning Blaze appears for the extra boss, similar to the end of Sonic Adventure 2. It is named "Burning" instead of "Super" as she uses the Sol Emeralds instead of the Chaos Emeralds. In Sonic the Hedgehog, Super Silver appears along with Super Sonic and Super Shadow.

Music
The music of the Sonic series is considered one of its strongest aspects. Sonic games have featured tunes composed by a variety of people; Masato Nakamura of J-pop band Dreams Come True was responsible for the music of the first two 16-bit games. Ys/Streets of Rage composer Yuzo Koshiro composed the music for the first 8-bit title, barring what was taken from the 16-bit title. Sega's in-house music company, Wavemaster, did the majority of the music in later titles. One Wave Master employee, Jun Senoue, is part of the band Crush 40, and through his ties to the band they have played the main theme tunes of the two Sonic Adventure games, Sonic Heroes, and Shadow the Hedgehog. Heroes and Shadow the Hedgehog also featured other bands, such as Julien-K. Richard Jacques, a frequent composer of music for Sega's games, contributed to the soundtracks of Sonic R and the Saturn/PC version of Sonic 3D Blast: Flickies' Island.


 * See also: List of Sonic the Hedgehog series songs

Characters
Since Sonic's first appearance in 1991, many more characters have appeared, and most of them have been added to main cast. Many of these characters have garnered steady fanbases since their inclusion into the franchise, while other longtime fans have criticized them for allegedly taking the gameplay focus off Sonic. Here are the main characters arranged in order of appearance:

Sonic the Hedgehog: The series' principal hero. Sonic possesses incredible super speed and numerous other abilities, and uses his skills to save the world from Dr. Robotnik. He is impatient, laidback, confident and always on the look-out for an adventure.

Dr. Eggman: Also known as Dr. Robotnik, Eggman is Sonic's arch nemesis and the series' main villain. He is extremely intelligent, egg-shaped, and has a giant brown mustache. Eggman is an expert in robotics and wishes to conquer the world and build the Eggman Empire. However, Sonic and his friends always stand in his way. In many cases, his own plans ironically out do himself.

Miles "Tails" Prower: Sonic's best friend. He is a two-tailed fox who can fly for a limited time by spinning his tails rapidly. He is a skilled mechanic and often takes care of Sonic's plane called the Tornado. He pilots a machine called the Cyclone, which is an upgraded version of the Tornado with battle-mech capabilities.

Amy Rose: A pink hedgehog who has become Sonic's self-appointed girlfriend, first seen in Sonic the Hedgehog CD. Ever since Sonic and Amy met, she has been in love with Sonic and she now wants him to marry her. Amy is quite strong and smashes enemy forces down with her trusty Piko Piko Hammer.

Metal Sonic: The robotic counterpart of Sonic the Hedgehog, who is created by Dr. Robotnik. He seems to believe that he is in fact the true Sonic, and that Sonic is his copy. In Sonic Heroes he betrayed his creator, and took the task of trying to achieve world domination into his own claws.

Knuckles the Echidna: The last living echidna, and Sonic's hotheaded friend and rival. Knuckles resides on Angel Island, where he guards the Master Emerald, the source of the island's ability to float in the sky. Knuckles is very strong; his spiked fists are capable of smashing through boulders as well as allowing him to climb walls. The nature of his echidna spikes allows him to glide in the air for periods of time.

Chaotix: A team of misfits who have started their own detective agency. The Chaotix consists of Vector the Crocodile, Espio the Chameleon and Charmy Bee. They met for the first time when they fought against Dr. Robotnik in Knuckles Chaotix, along with Mighty the Armadillo.

Big the Cat: A big purple tabby cat who loves fishing. His best friend is a frog named Froggy, who he constantly keeps losing. Big lives with his buddy in a peaceful hut in the Mystic Ruins.

E-102 Gamma: A robot created by Dr. Robotnik. Originally a part of the E-Series, he, thanks to Amy Rose, became good spirited and decided to save his friends. In the end, he was destroyed by E-101 Beta.

Shadow the Hedgehog: Shadow is a mysterious, black hedgehog resembling Sonic in appearance and skills. He is the Ultimate Life Form created by Gerald Robotnik with Black Doom's DNA on the Space Colony ARK over five decades ago. He recently suffered from amnesia but has regained all of his memories since. He can use Chaos Control to distort time and space.

Rouge the Bat: Rouge is a treasure hunter and a spy for GUN. She is full of feminine charm and can be very manipulative. She is Knuckles' rival.

Cream the Rabbit: A naive young rabbit who lives with her mother, Vanilla. Cream's best friend is a Chao called Cheese (which she uses as missile). Because Cream has been brought up like a princess, she does not like being involved in other peoples' affairs. She can fly using her large ears.

E-123 Omega: An robot created by Dr. Robotnik. He is the last of the E-100 series of robots and seeks revenge on Robotnik for shutting him down. Rouge accidentally activated him when trying to free Shadow from Robotnik's base. Since then, he has became good friends with both of them.

Blaze the Cat: A female, pyrokinetic, lavender cat from Silver's time period. As guardian of the Sol Emeralds, it is her duty to prevent anyone from taking them away from her. She is somewhat shy, and tends to conceal her real feelings.

Silver the Hedgehog: A mysterious white hedgehog from the future. Silver traveled through time to stop Sonic, who he believed to be the Iblis Trigger. Unlike Sonic, he utilizes psychic powers.

Regional variations
To create distinctive Sonic products in various markets, Sega initially developed two different back-stories for the instruction booklets; the Japanese version (which is considered the "true" canon by most fans), and the version for all other regions, which was the version built upon by the comics, cartoons, and other media. (This version was retconned in 1999, when Sonic Adventure came out, which continued the Japanese storyline in all regions.)

Differences between regional storylines include the setting of the game (while the non-Japanese version had the game set on a fictional planet called Mobius, the Japanese version had the games set on Earth from the very beginning), as well as Dr. Eggman's name, which was Dr. Robotnik in the American version. (Although now, Robotnik is his official last name while Eggman is a nickname made up by Sonic and his friends for him.)

Chronology
Saga 1 - Meet Sonic the Hedgehog


 * Sonic the Hedgehog – (Genesis) (1991)
 * Sonic 1 is the first game in the series and establishes the canon's foundation. It introduces the protagonist, Sonic the Hedgehog, a 14-year-old hedgehog; the antagonist, Dr. Ivo Robotnik, a malevolent human scientist; basic gameplay elements; and bosses that have reappeared in later games, such as in Sonic Advance.


 * Sonic the Hedgehog (8-bit / 16-bit Master System) - (Game Gear) (Master System) (1991)
 * The Game Gear and the Master System both featured this game, although each one was very slightly different. Additionally, the Game Gear version was 8-bit, and the Master System version was 16-bit. As far as the story goes, Sonic is again saving the world from Dr. Robotnik.


 * SegaSonic the Hedgehog - (Arcade) (1993)
 * Seeing as how this game does not feature Tails, yet was released after Sonic the Hedgehog 2 for the Sega Genesis, this would theoretically be placed at the end of the list of games where Sonic fights without Tails; however, this game was released before Sonic CD and therefore takes place before it as well.


 * Sonic the Hedgehog CD – (Sega CD) (1993)
 * Originally released after Sonic the Hedgehog 2 for both the Sega Genesis and the Sega Game Gear, Sonic CD was in production alongside the other two games and could have possibly supposed to come out before hand. One important factor that determines where this game takes place in the timeline is that Sonic has not yet met Tails, or at least does not fight Dr. Robotnik with him by his side.


 * Sonic Labyrinth - (Game Gear) (1995)
 * Because this game came out recently after Tails Adventure, this game can either be placed in the timeline during the events of Tails Adventure assuming that the Western storyline occurred and the two split up, or it can take place before Sonic met Tails according to the Japanese storyline. This timeline will assume that the Japanese storyline is the correct one.

Saga 2 - Meet Miles "Tails" Prower


 * Tails' Skypatrol - (Game Gear) (1995)
 * Because of the original intention of Tails not yet have meeting Sonic in Tails Adventure, and because this game came out before Tails Adventure, this game takes place before the events of Sonic the Hedgehog 2 for the Sega Game Gear. It can either take place during the events of “Meet Sonic the Hedgehog” or after and before “Sonic and Tails Together".


 * Tails Adventure - (Game Gear) (1995)
 * Although the Western story states that Tails split up from Sonic for a while, the Japanese story states that, during the events of this game, Tails has not yet met Sonic. Assuming that the Japanese story is the case, it can be included in “Meet Miles ‘Tails’ Prower”.

Saga 3 - Sonic and Tails Together


 * Sonic the Hedgehog 2 (8-bit) - (Game Gear) (Master System) (1992)
 * The story states that Tails gets kidnapped by Dr. Robotnik. After this game, Tails fights alongside with Sonic, so it can be assumed that this game marks the beginning of Sonic training Tails to fight for himself.


 * Sonic the Hedgehog 2 – (Genesis) (1992)
 * The instruction booklet indicates that Sonic 2 comes one year after the events of Sonic 1. The game features new sprites for Sonic who appears to be slightly older (he is now 11), and also introduces Tails (who is only four), Sonic's sidekick.  Super Sonic makes his first appearance.The reason that this game does not take place after Sonic Chaos, even though the end of Sonic the Hedgehog 2 should lead directly into the beginning of Sonic the Hedgehog 3 (since the Death Egg lands on Angel Island), is that we can assume that Dr. Robotnik did not remain on Angel Island while the Death Egg was being rebuilt. See Sonic Triple Trouble for more information.


 * Sonic Chaos - (Game Gear) (Master System) (1993)
 * The storyline to Sonic Chaos, like most Sonic stories, revolves around Dr. Robotnik and his quest for world domination via the use of the mysterious Chaos Emeralds to create nuclear weapons and lasers. (According to the U.S. version of the instructional manual.)


 * Sonic the Hedgehog Spinball - (Genesis) (Master System) (Game Gear) (1993)
 * Dr. Robotnik takes control of Mount Mobius, turning it into his new Veg-O-Fortress, which transform helpless animals into robotslaves at an astounding rate. In the end, Sonic retrieves the Chaos Emeralds and takes down Dr. Robotnik once, again.

Saga 4 - Knuckles the Echidna and the Death Egg’s Revival


 * Sonic the Hedgehog: Triple Trouble - (Game Gear) (1994)
 * Because Knuckles has realized that Dr. Robotnik is evil in the events of Sonic and Knuckles, there is no way that Knuckles would once again side with the evil mastermind. Therefore, even though this game was released after Sonic and Knuckles, this game can be seen as placed before the events of Sonic the Hedgehog 3, where Knuckles was still sided with Dr. Robotnik, assuming that Knuckles stayed on his side throughout the entire game. The only problem with this is the fact that Sonic the Hedgehog 2 for Sega Genesis should lead directly into Sonic the Hedgehog 3. Therefore, we are to assume that Dr. Robotnik met Knuckles prior to the events of Sonic the Hedgehog 3 and that landing on Angel Island after his downfall in Sonic the Hedgehog 2 was more than just an accident. The most logical would be that by placing this game between Sonic the Hedgehog 2 and Sonic the Hedgehog 3, Dr. Robotnik could have met Knuckles after crash landing on Angel Island, in which he did not remain there while the Death Egg was being rebuilt and had his minions rebuild it for him, returning to the Death Egg and Angel Island after his other plans are foiled in the meantime and his Death Egg is near completion. This game introduces Fang the Sniper, AKA Nack the Weasel,


 * Sonic the Hedgehog 3 and Sonic & Knuckles – (Genesis) (1994)
 * Sonic 3 and Knuckles comes [about two hours (source?)] after the events of Sonic 2 and recycles its sprites and game engine core. Inside the game, Sonic's story happens first, then Knuckles' story.  In Sonic's story, Angel Island is in the sea and Knuckles is his enemy; in Knuckles' story, Angel Island is floating in the sky and Sonic is his ally.


 * Knuckles' Chaotix - (32x) (1995)
 * Introduces Vector the Crocodile, Charmy the Bee, Espio the Chameleon, Mighty the Armadillo, Heavy, and Bomb. The Metal Sonic in this game goes under a type of transformation in which it grows huge and is red. It also has a large laser cannon on its chest and tries to crush the player with its large hands. Prior to the fight, Metal sonic is seen going with Dr. Robotnik into a ring, and then this Metal Sonic appears. It is often times known amongst fans as Super Metal Sonic or Mega Metal Sonic. In the end, it is defeated.


 * Sonic the Fighters - (Arcade) (1996)
 * Dr. Robotnik has built the Death Egg II, and it is up to the heroes to foil his Death Egg plans once and for all. Introduces Bark the Polarbear and Bean the Dynamite.The Metal Sonic in this game is a new type known as Mecha Sonic Model No.29, but by playing as it through a hack, the name is known as RocketMetal.

Saga 5 - Eggman's Last Stand


 * Sonic 3D Blast - (Mega Drive) (Genesis) (1996)
 * Dr. Robotnik discovers Flicky Island and its inhabitants, the Flickies. He plans on using them and their ability to travel anywhere via large rings by turning them into robots to help him search for the Chaos Emeralds.


 * Sonic Blast - (Game Gear) (1996)
 * While this game was released at the end of 1996 in conjunction with the similarly named Sonic 3D Blast, it is worth noting that both games have little in common. No enemies, levels, or bosses, are shared between the games. The story is also completely different. Sonic and Knuckles join together to collect five of the Chaos Emeralds and confront Eggman at Silver Castle. (See source for details)

Saga 6 - Amy Rose as the Newest Recruit


 * Sonic Advance – (GBA) (2001)
 * While some may assume Sonic Adventure comes first, Sonic Advance comes first for two clear reasons: (1) Sonic's red Tornado biplane appears in it, but it was shot down and destroyed in Sonic Adventure; (2) In all the games after this game, including Sonic Adventure, Dr. Robotnik has a much more complicated way of taking over the world, but in Sonic Advance 1 and 2, Robotnik has the same old scheme: keep Sonic distracted with his robots while he tracks down the Chaos Emeralds.


 * Sonic Advance 2 – (GBA) (2002)
 * There are three reasons why Sonic Advance 2 occurs here. It is evident from the game and official material that Sonic Advance 2 closely follows its prequel.  In Sonic Adventure's GameCube remake, Cream has a cameo appearance when she gives Sonic the Ice Stone, whom she met in this game.  The third reason is that Robotnik's strategy is essentially unchanged from Sonic Advance.


 * Sonic Adventure – (Dreamcast) (1998)
 * Adventure marks the first of the fully 3-D and evolved Sonic games. Sonic Adventure is closely connected to Sonic & Knuckles, as seen by the fall of Angel Island. It also makes several references to earlier games: Sonic making jokes at Knuckles' expense about his history with Robotnik (now called Eggman); Tails' dream of when he first met Sonic; and Amy's flashback of when Sonic first rescued her from Eggman's base on the Little Planet while being chased by Metal Sonic.


 * Sonic Shuffle - (Dreamcast) (2000)
 * The story involves Sonic and company getting caught up in a mess in a world called Maginary World, which they inadvertently stumble upon one day. A villain named Void has shattered the Master Precioustone into many pieces, resulting in chaos in every part of the world. Lumina Flowlight and the rest of Maginary World are counting on Sonic to restore it and bring Illumina back, who mysteriously disappeared after the disappearance of the Precioustone. (See source for details)


 * Sonic Adventure 2 – (Dreamcast) (2001)
 * It is Sonic Adventure's sequel, and the events within closely follows it's prequel. This game introduces Shadow the Hedgehog as Sonic's cold-hearted arch rival.

Saga 7 - Cream the Rabbit as the Newest Ally


 * Sonic Pinball Party - (GBA) (2003)
 * The story is set in Casinopolis (in Station Square), where Doctor Eggman turns the people gambling into robots, and brainwashes Miles "Tails" Prower and Amy Rose. Sonic must rescue his friends by winning a pinball tournament called the "Egg Cup Tournament." (See source for details.) Also, even though Cream was introduced in Sonic Advance 2 and Sonic Adventure DX, it is because they came out later on than when they were actually placed in the timeline. At this point, Cream becomes a recurring ally.


 * Sonic Heroes – (GameCube, PS2, XBox) (2003)
 * It continues 5 months after the storyline of Sonic Adventure 2. The game stars Metal Sonic as the antagonist of the game instead of Dr. Eggman. In Team Dark's story, Shadow begins his story inside a cryogenic capsule; Rouge is surprised that he is still alive. In Team Rose's story, Amy begins her story relaxing at the beach in a scene reminiscent of the opening cut-scene of Sonic's story in Adventure.


 * Shadow the Hedgehog – (GameCube, PS2, XBox) (2005)
 * It makes several references to Sonic Heroes, and, in Sonic Battle, Shadow is completely aware of his past and rants on about trusting in Maria, but in this game, he can only remember one tidbit of his memory, and, he doesn't even know who Maria is. "And who is this 'Maria'?" &mdash; Shadow the Hedgehog


 * Sonic Battle – (GBA) (2003)
 * Even though this game was released before Sonic Heroes, it comes after, because Rouge comments about E-102 Chaos Gamma (who she believes to be a Guard Robo) looking like Omega, whom she met in Sonic Heroes. "...that Guard Robo looked just like Omega" &mdash; Rouge the Bat. The second reason was explained above, in the case with Shadow's past.


 * Sonic Advance 3 – (GBA) (2004)
 * It is seen that this game closely follows Sonic Battle, and it continues Battle's storyline, seeing as Eggman found Emerl's pieces and re-built him into G-mel. Emerl is a robot introduced in Sonic Battle.


 * Sonic Riders - (GCN) (PS2) (XBOX) (2006)
 * This game introduces the Babylon Rouges- Jet the Hawk, Wave the Swallow, and Storm the Albatross- as well as the E-10000 series. Jet and Sonic seem to have a rivaling relationship over who is the fastest thing alive, and, in the end, Babylon Garden's secret treasure is uncovered after defeating the Babylon Guardian.

Saga 8 - Traveling through Time and Space


 * Sonic the Hedgehog – (XBox 360) (2006) (PS3) (2007)
 * The placement of this game in the timeline is debatable. Although Blaze seemingly recognizes Sonic when she utters "Blue Hedgehog......?" (whom she first met in Rush), in the end of this game, Blaze is sealed away into another dimension. This could possibly be the dimension that Blaze lives in in "Sonic Rush". Although this game seems to retcon itself by erasing the events of the game from history, Blaze is not seen in the end when the past, present, and future merge. Therefore, Blaze and the future Iblis sealed inside of her have been sent away from the timeline, resulting in her own existence being erased from her home world/dimension. Additionally, Silver the Hedgehog is introduced in this game.


 * Sonic Rivals - (PSP) (2006)
 * In this game, Eggman Nega turns out to be the main antagonist of the game who hails from the future. Masquerading as Dr. Eggman in the past, he uses a special camera to turn everyone into cards on Onyx Island, an island he brought along with him from the future. His master plan is to change his destiny by turning the whole planet into a card that he can control. It is revealed that he was never an alter ego, but a descendant of Eggman. (See source for details) Additionally, Silver the Hedgehog makes a reappearance in this game.


 * Sonic Rivals 2 - (PSP) (2007)
 * This game introduces Metal Sonic version 3.0, which is a robot built by Eggman Nega. Because Dr. Eggman is not the main antagonist of the game, he sends Metal Sonic as to help fight against the threat of Eggman Nega. Silver again makes another appearance in this game. By the end of the game, Eggman Nega is sealed into the dimension that the Ifrit dwells in, the beast that he was trying to unleash throughout the events of the game. It is possible that the dimension that Eggman Nega is sealed into is the same dimension that Blaze was sealed into, explaining how the two came about in another dimension. It is also possible that, because Blaze has Iblis sealed inside of her, that when she was sent from her original dimension, perhaps the dimension with the Ifrit acted like a Magnet with the Iblis inside of her. By the events of Sonic Rush, the dimension is not threatened by the Ifrit, so something must have happened before then. It is possible that Eggman Nega helped get rid of the Ifrit when he realized that he could not control it.


 * Sonic Rush – (DS) (2005)
 * It has to happen after Sonic Advance 3, because several elements introduced in Advance 3 are re-used in this game, such as Cream's house and the new looking Flickies. Blaze the Cat is introduced.


 * Sonic Rush Adventure (DS) (2007)
 * It's most likely that this game comes next due to the fact that Dr. Eggman and Eggman Nega still have a working relationship, as the Sonic Rivals series shows that Eggman Nega develops a tendency to work alone or dispose of Eggman first.

So far the chronology of Sonic and the Secret Rings,sonic r, sonic drift,  Mean Bean Machine, Sonic the Hedgehog Pocket Adventure,Blue Sphere, SegaSonic Cosmo Fighter,Sonic Galaxy,Sonic's Edusoft and Sonic Eraser has not yet been confirmed.

Spin-offs
The Sonic video game franchise has led to a large number of spin-offs starring Sonic. Each spin-off incorporates aspects from the games to varying degrees.

Animations
Adventures of Sonic the Hedgehog (or AoStH for short) is an American animated television series that was first broadcast in September, 1993, and has been running in cartoon syndication ever since. It follows the escapades of Sonic and Tails as they stop the evil Dr. Ivo Robotnik and his array of vicious robots from taking over the planet Mobius. The plots very loosely followed the storyline of the video games series; at the time the Sonic games were still quite new, and lacking much plot or character development, which was in turn filled in by the show's writers.

The animated television series simply called Sonic the Hedgehog originally aired from September 1993 to June 1995. While Adventures of Sonic the Hedgehog is known for its bright colors and whimsical humor, Sonic the Hedgehog featured darker stories which constituted a departure from the tone of the Sonic games of the time. To distinguish between the two series, fans typically refer to this series as SatAM because it was a Saturday morning cartoon while Adventures of Sonic the Hedgehog aired on weekdays in syndication, and using the show's full title would cause confusion in many situations because the show's title is the same as the character's name.9

A two-episode OVA film series based upon the game Sonic CD and the video game series as a whole, Sonic the Hedgehog: The Movie was made in Japan in 1996 and released as a dub in North America in 2000. Unlike the games, the film takes place on a world named Planet Freedom that, as with many anime series, appears to be a crossbreed of a fairytale land and Earth. At the time of its creation, the anime did not differ as far from official canon as it does today; at this point, it could be considered to take place in an a different continuity than the games, just like other versions of Sonic from other media.

The cartoon Sonic Underground ran for only one season, 1998 to 1999; it bears little relation to other entries featuring Sonic (including previous games, comics and animated series), and shares few established characters. 65 episodes were originally produced, and of those, only 40 were released. Unlike it's predecessor, SatAM, the heroes do not remain in a sanctuary-like refuge but instead travel around Mobius to battle Robotnik's forces on a global scale. The Mobian civilisation featured in the series includes multiple cities, a poor underclass and an aristocracy for the heroes to interact with. Sonic Underground is the only animated series based on Sonic where Tails has not made an appearance.

The anime Sonic X is the longest-running and most successful animated series based on Sonic to date. Originally planned as a 52 episode series that would be inspired by the storylines of the Sonic Adventure series, Sonic X has now expanded to 78 episodes with the latest 26 episodes set primarily in outer space. The series borrows more from the games than any other Sonic cartoon before it; with the exception of Blaze the Cat, E-123 Omega, Babylon Rogues, Silver the Hedgehog, and Metal Sonic, every significant and playable video game character has made an appearance in the series. Sonic X is also the only animated series to include Super Sonic. Despite these similarities, it is not completely compatible with the video game canon if only for the fact that it shows Sonic being transported to Earth from another world; in the games, Sonic has always lived on Earth.

Comics
The Sonic the Hedgehog manga series, published in Shogakukan's Shogaku Yonensei (literally "fourth-year student") was written by Kenji Terada and it was illustrated by Sango Norimoto. The manga, which started in 1992, was about a hedgehog boy named Nicky who can turn into Sonic the Hedgehog. Sonic fights Dr. Robotnik, with Tails tagging along to help him.

Sonic the Comic, known to its many readers as STC, was a UK children's comic published by Fleetway Editions between 1993 and 2002. Although it was the UK's official Sega comic, Sonic the Comic established its identity and ongoing storyline and setting when Sonic, Tails and their friends were sent forward in time six months. During their absence, Doctor Robotnik successfully conquered the entire planet of Mobius, and Sonic's group were forced underground, operating as "freedom fighters" attempting to bring down Robotnik's rule of the planet. Due to an aggressive series of budget cuts on the part of Fleetway, the series went into full reprint by issue 184; the final story ended with a number of loose ends left untied. An online fan based comic, called STC-Online, has been set up to continue the STC story starting from where the origional STC story left off and begining with issue 224, due to STC being reprints from issues 185 to 223. It has recieved positive feedback from both fans and writers of the origionl STC.

Sonic the Hedgehog is an ongoing series of American comic books published by Archie Comics. All of Archie's Sonic-related series, miniseries and specials take place in the same fictional universe. This universe features a mixture of characters, settings and situations from the video games, the SatAM cartoon, the various other incarnations of Sonic, and many elements unique to the comic universe. The current status quo of the comic deals with a full-scale war between the Eggman Empire, ruled by Robotnik, and the restored Kingdom of Acorn, currently ruled by King Elias Acorn.

Sonic X is the title of an ongoing comic book series that exists to supplement the stories from the animated series of the same name. It began in September 2005 and was originally meant to be a four-part series; due to the positive reaction to the series' announcement, it was extended to ongoing status before the first issue premiered. The comic is unique in that it is not directly based on the games; the comic is based on the television show and takes place in its expanded fictional universe. The comic borrows elements from the series first two seasons of the show, including Eggman's fort, destroyed in Season One on the cartoon, and characters from the Sonic Adventure storyline.

Notes and references
In addition to information taken from the Sonic the Hedgehog games themselves, the instruction booklets of the US and Japanese versions of the games were also used as references for this article.