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Fighting Games
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Sonic the Fighters / Sonic Championship
3D Fighter (Conventional) by AM2 / Sega
Arcade
Worldwide
6/1/1996
Sonic Gems Collection (Playstation 2)
Compilation release, only released in Japan and PAL regions.
Worldwide
8/11/2005
Sonic Gems Collection (Gamecube)
Compilation release.
Worldwide
8/11/2005
Sonic the Fighters (Playstation Network)
Adds several extras, including playable bosses and a legitimate, playable un-buggy Honey the Cat.
Worldwide
11/27/2012
Sonic the Fighters (Xbox Live Arcade)
Adds several extras, including playable bosses and a legitimate, playable un-buggy Honey the Cat.
Worldwide
11/28/2012
Lost Judgment (PlayStation 4)
Playable from the in-game "Club Sega" arcade.
Worldwide
09/24/2021
Lost Judgment (PlayStation 5)
Playable from the in-game "Club Sega" arcade.
Worldwide
09/24/2021
Lost Judgment (Xbox One)
Playable from the in-game "Club Sega" arcade.
Worldwide
09/24/2021
Lost Judgment (Xbox Series X)
Playable from the in-game "Club Sega" arcade.
Worldwide
09/24/2021
Lost Judgment (Windows)
Playable from the in-game "Club Sega" arcade.
Worldwide
09/24/2021
Sonic Gems Collection (Xbox)
Compilation release. Was to be a North American-exclusive release until Sega pulled the plug on the NA release of the PlayStation 2 version. The Xbox version went with it.
Worldwide
Saturn
Advertised, but ultimately unreleased.
Worldwide

Fighters
Amy Rose
Arcade
Bark
Arcade
Bean the Dynamite
Arcade
Dr. Robotnik
Arcade
Espio
Arcade
Fang the Sniper
Arcade
Honey
Playstation Network
Knuckles
Arcade
Metal Sonic
Arcade
Sonic
Arcade
Tails
Arcade

Fun Facts
Sweeter Than Honey
Hidden deep within the code of Sonic the Fighters/Championship is a completely finished character by the name of Honey. Honey is an anthropomorphic cat that is dressed identically to the Honey/Candy character in Fighting Vipers. This version of Honey, wearing her Player 2 colors, was actually first seen briefly in Sanman's portion of the Fighting Vipers intro.

Honey was finally made playable in the 2012 Xbox Live/PlayStation Network port of Sonic the Fighters, with her slight graphics glitches cleaned up.
Erinaceomorphs and Serpents
Sonic Championship is reportedly the result of AM2 designer Masahiro Sugiyama slipping Sonic and Tails into Fighting Vipers out of boredom. Sega big cheese Yu Suzuki happened to see this, and liked the idea, presenting it to Sonic creator Yuji Naka. Naka approved, and instead of just including Sonic and Tails as secret characters, AM2 decided to build a completely new game around the characters. Sonic can still be accessed in the arcade version of Fighting Vipers through extensive hacking.

Credits
Worldwide
Music Department
Anybody who worked on a game's original score.
Takenobu Mitsuyoshi