Sonic the Fighters

Sonic the Fighters (ソニック・ザ・ファイターズ), also called Sonic Championship on western cabinet artwork, is a fighting game in the Sonic the Hedgehog series. The game's original title is used in North American and European releases of Sonic Gems Collection, as well as its HD release.

Story
Doctor Ivo "Eggman" Robotnik has released the Death Egg II, and now Sonic the Hedgehog and Miles "Tails" Prower must stop him! However, their new airship only supports 1 passenger, and to defeat Eggman, they need 8 of the Chaos Emeralds (7 in the majority of Sonic continuities). The eight wielders of the Chaos Emeralds, including Sonic and Tails themselves, then must take part in a hand-to-hand fighting tournament, with the winner taking all the Chaos Emeralds. The participants, in order of combat, are:
 * Knuckles the Echidna
 * Amy Rose
 * Bark the Polarbear
 * Espio the Chameleon
 * Miles "Tails" Prower
 * Fang the Sniper
 * Bean the Dynamite
 * Sonic the Hedgehog

Whichever character the player is controlling is cloned by Eggman during their battle (presumably by copying their DNA), so that the player fights all eight of them. For instance, if the player controls Sonic, then in the eighth battle, Eggman will create a clone of Sonic. (This is an ability of Eggman's machines used in no other games since.)

After arriving at the Death Egg II, the heroes get a surprise visit from Metal Sonic. After defeating him, the Death Egg II begins to fall apart as Doctor Eggman in his mech suit challenges the victor (the round must be finished to complete the story). Unlike other battles in the game, the player only gets one shot to take down Eggman.

The victor escapes the Death Egg II before it explodes, however, the post credits scene shows Eggman and Metal Sonic also escaped the explosion and head back to Earth.

Characters
Sonic can also become Super Sonic in story mode. Without losing a life since the 1st fight, the player enters Hyper Mode in the 2nd Round against Metal Sonic.

Added in HD Release

 * Honey the Cat - Press start on Amy (all of her glitches are now fixed)
 * Dr. Eggman - Press start on Bean
 * Metal Sonic - Press start on Sonic

Hacked Characters

 * Eggman (Mecha)
 * Eggman (Spaceship)
 * Eggman's Robo


 * Rocket Metal
 * Unused and scrapped characters can become playable via hacking.

Arenas

 * South Island
 * Flying Carpet
 * Aurora Icefield
 * Mushroom Hill
 * Canyon Cruise
 * Casino Night
 * Dynamite Plant
 * Giant Wing
 * Death Egg's Eye
 * Death Egg's Hangar

Sega Saturn version
There was a planned Sega Saturn version to the game, but it was canceled for unknown reasons. There are also numerous unused objects like apples and rockets, which could have been used.

Trivia

 * A special theme plays when pitting Sonic and Knuckles against each other in versus.
 * Amy's muzzle is apricot in all her promo pics, but white on her playable character. The HD release changes the playable character's muzzle back to apricot.
 * However there is a glitch in the HD release where winning a match as Honey makes Amy's muzzle turn white again.
 * Honey the Cat was a character who was going to be in the final game, but scrapped for unknown reasons. She is currently only playable through hacking the Arcade version.
 * But in the 2012 re-release on PlayStation Network and Xbox Live, Honey (along with Metal Sonic and Dr. Eggman) is added to the character selection.
 * In the English version, Dr. Robotnik's name was misspelled Robotonic in the intro of the game for unknown reasons, however inDr-robotonic.jpg the final battle the character is listed as Dr. Eggman, and his Vs. Card says "Dr. Eggman" with "Robotnik" under it. A similar mistake is made again in a scene of Sonic Adventure when E-102 Gamma refers to Dr. Robotnik as Dr. Robotonik in English subtitles.
 * Eight Chaos Emeralds appear in this game, whereas the majority of other games in the series include only seven.
 * Ray the Flying Squirrel was originally set to appear in the game as an announcer (in the same effect as the announcers from Fighting Vipers, Last Bronx, Tekken, Soulcalibur, Dead or Alive and Virtua Fighter), but was scrapped in favor of having "boxing bell" sound effects instead.
 * Many of Sonic's attacks in Super Smash Bros. Brawl can be traced back to this game, as well as Sonic Battle.
 * On one of the two pictures of Sonic (the ones where he appears to be in the air), the picture has the gold buckle on his shoe, and the other does not.
 * The rocket in the Sega Saturn intro of Fighting Vipers (next to Mirror Honey) is Tails' rocket from Sonic the Fighters, the Lunar Fox.
 * This game's character select icons of Sonic, Knuckles, Amy and Fang are all taken from their Sonic Drift 2 artwork. Also, the Amy Rose icon used artwork from Sonic the Hedgehog CD.
 * The only way to play as Super Sonic is to reach the 2nd round against Metal Sonic without losing a single round. Many fans state that this is the hardest Super Sonic transformation requirement in any Sonic game.
 * In the Dreamcast game, Shenmue, many of the characters in this game appear in their promo art as collectible capsule figurines that Ryo can retrieve from a dispenser, or in special cases, such as obtaining Super Sonic and Metal Sonic, they can be won in a lottery. These figures serve no real purpose but to simply be collected.
 * Interestingly enough, in Shenmue, if one were to rotate the Fang figurine where he is standing on both feet, his right hand appears to have five fingers while his left hand has four.
 * This game marks the first appearance of Amy's Piko Piko Hammer, which played a major role for most of Amy's attack techniques in future games.
 * This is the only game in the series where Bark the Polarbear and Bean the Dynamite make an appearance, aside from their cameos in Sonic Generations.
 * A Sonic the Fighters arcade machine appears in the Disney film, Wreck-It Ralph.
 * The way how the player's character takes Tails's rocket and flies it into space was later done in a similar way in Sonic the Hedgehog 4: Episode I.