SegaSonic the Hedgehog

SegaSonic the Hedgehog
Developers: Sonic Team, Sega AM3 Publisher: Sega Platform: Arcade (Sega System 32) Released in JP: June 1, 1993 Released in US: September 18, 1993 Released in EU: September 18, 1993 Released in AU: October 31, 1993 Released in KR: December 10, 1993 Released in BR: November 19, 1993 This game has unused graphics. This game has a prototype article

SegaSonic the Hedgehog was Sonic the Hedgehog, Mighty the Armadillo, and Ray the Flying Squirrel's only game together until the release of Sonic Mania Plus in 2018.

To do: There are loads more sprites that could be included here, including Robotnik's many, many other sprites (Source). Check for other things, like unused sounds or debug menus to uncover. This guy on Twitter has found a plethora of unused content (there may be more tweets): [1], [2], [3], [4]. He said on Sonic Retro that he's going to be documenting all of his findings on his website, and is cautioning that it's going to be a lot of stuff that has never been documented.

Unused Graphics

Title Graphics

Unused	Used

Early versions for the characters on the title screen, without the shine on the eyes and the nose missing/unfinished. While Sonic was seen in the prototype, Ray and Mighty were nowhere to be seen outside of the graphics data.

Player Character Graphics

Some sprites of the characters flexing their muscles, which possibly would have been used when continuing the game. The code to have these animations display in the game still exists, but doesn't appear to be used anywhere.

(Source: Suddenデス)

Unused	Used

Sonic had his face mercifully redrawn to make him look less like roadkill, while Ray got his patagia enlarged.

Unused	Used

Sonic got his arms reanimated, Ray had his proportions slightly corrected, and Mighty's face was redrawn.

(Source: Ragey, Kallus)

Dr. Eggman Sprites

It seems that Eggman was supposed to use some gadgets and thingamajigs himself to prevent players from reaching him. Probably meant to show up in other stages in Eggman Island more than waiting for the main character(s) to meet him at the computer room in the final level.

Unused Localization Version

Although the international releases were, for whatever reason, not localized or translated, there are many remnants of a said planned version.

Archie Comics/SatAM Dr. Robotnik

A largely complete set of sprites of Robotnik as he looked on ABC's Sonic the Hedgehog cartoon (generally nicknamed SatAM) for use in the international version. He can also be seen in Archie Comics of the same title. It's more than likely intended for a promotion of SatAM, just like how Dr. Robotnik's Mean Bean Machine did for Adventures of Sonic the Hedgehog. The game uses the Eggman sprites in all regions. The only sprites that appear to be missing are for him riding around behind the title screen and the intro where he traps the main character(s) while riding on a Eggman-face tank.

Even the little details were accounted for to complete the Robotnik experience.

English Dialogues

A complete set of English dialogue bubbles. Interestingly, one of the bubbles has both an "Eggman" and a "Robotnik" variant.

(Source: Ragey, Kallus)

Miscellaneous

These might have been used when setting to multiple coins per one credit, but they don't appear no matter what dipswitch settings are used.

A sprite viewer menu of sorts.

(Source: Ragey, Kallus)