This page details one or more prototype versions of Sonic the Hedgehog CD (Sega CD).
- Warning, as there are still people fooled by this: The so-called "409 prototype" is actually a hoax created by Sonic fan scene member Nemesis.
Sonic CD has a ton of available prototypes, including several localization builds.
Pre-Japanese Release Builds
Builds dated prior to the game's Japanese release.
| Ver0.02 Dated December 4, 1992. The earliest known build, prepared for the Yuusei Sega World event in Japan that month. Predates the period before Sonic CD was delayed from its originally-planned March 1993 release. While only two levels are present, the build sheds some light on the game's development. |
| Prototype 510 Dated May 10, 1993. A rough early build that was dumped by a group called "Sega Extreme" in 2000. |
| Ver0.28A Dated May 12, 1993. Similar to 510, with some minor differences. |
| Ver0.51 Dated June 21, 1993. Special Stages are now playable, and the game can now (almost) be completed without cheats. |
| Ver0.70 Dated July 12, 1993. Much more complete, but still unfinished in places. |
| Ver1.05 Dated August 1, 1993. Just about complete, with only minor differences left. |
Ver1.09
This prototype is documented on Hidden Palace.
Dated August 6, 1993, the same day as the final Japanese release. A close-to-final build which came with cover art and was released as a demo CD in Japan. It only has Palmtree Panic playable by normal means, although the rest of the game can be played with the Level Select code.
A second version, seemingly for Sega of Europe, was dumped on October 26, 2019.
(Source: BetaArchive, Sonic Retro)
Post-Japanese Release Builds
The game is finalized by this point.
Ver1.11
A PAL build dated August 19, 1993. Aside from a slightly different IP loader and Author for the Redbook Audio tracks, it's identical to the final.
Prototype 920
This prototype is documented on Hidden Palace.
A US build dated September 20, 1993, still with the original soundtrack. As the game was being reviewed for its US release, Sega of America decided to have a new soundtrack composed for that market, which would polarize fans for years to come.
It has the addition of the updated copyright on the title screen and the level-restart code seen in the US final.
(Source: Sonic Retro, Secrets of Sonic Team, Sonic Cult)
Ver1.15
This prototype is documented on Hidden Palace.
A pre-release US build dated October 13, 1993, with the only difference being that the raw Redbook Audio track data is authored differently.
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Sega Genesis | Sonic the Hedgehog (Prototype) • Sonic the Hedgehog 2 (Prototypes) • Sonic the Hedgehog 3 (Prototype) • Sonic & Knuckles (Prototypes) • Sonic 3 & Knuckles • Sonic 3D Blast (Prototypes) |
Sega Master System | Sonic the Hedgehog • Sonic the Hedgehog 2 • Sonic Chaos (Prototypes) • Sonic Blast |
Game Gear | Sonic the Hedgehog (Prototype) • Sonic the Hedgehog 2 (Prototype) • Sonic Chaos (Prototypes) • Sonic Triple Trouble (Prototypes) • Sonic Labyrinth • Sonic Blast (Prototypes) |
Arcade | SegaSonic the Hedgehog (Prototype) |
Sega CD | Sonic the Hedgehog CD (Prototypes) |
32X | Knuckles' Chaotix (Prototypes) |
Windows | Sonic the Hedgehog CD (1996, 2011) • Sonic 3D Blast • Sonic Heroes • Sonic Adventure DX: Director's Cut (2004, Demo, 2011) • Sonic Adventure 2 • Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic the Hedgehog 4: Episode II (Prototype) • Sonic Generations (Demos) • Sonic Lost World • Sonic Mania • Sonic Forces • Sonic Colors: Ultimate |
Sega Saturn | Sonic X-treme • Sonic 3D Blast (Prototype) • Sonic the Hedgehog into Dreams... |
Dreamcast | Sonic Adventure (Prototypes) • Sonic Adventure 2 (Prototypes) |
Neo Geo Pocket Color | Sonic the Hedgehog Pocket Adventure (Prototypes) |
GameCube | Sonic Adventure 2: Battle (Demo) • Sonic Adventure DX: Director's Cut (Prototypes) • Sonic Heroes (Prototypes) • Shadow the Hedgehog |
Game Boy Advance | Sonic Advance (Prototype) • Sonic Advance 2 • Sonic Advance 3 (Prototype) • Sonic the Hedgehog Genesis |
PlayStation 2 | Sonic Heroes • Shadow the Hedgehog • Sonic Unleashed |
Xbox | Sonic Heroes • Shadow the Hedgehog |
Nintendo DS | Sonic Rush (Demo) |
Xbox 360 | Sonic the Hedgehog (Demo) • Sonic Unleashed (Preview) • Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic Generations (Demos) • Sonic Adventure 2 |
Wii | Sonic Unleashed • Sonic Colors • Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic and the Secret Rings • Sonic and the Black Knight |
PlayStation 3 | Sonic the Hedgehog • Sonic Unleashed • Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic Adventure 2 • Sonic Generations (Demos) • Sonic the Hedgehog CD (2011) |
Nintendo 3DS | Sonic Generations |
Wii U | Sonic Lost World • Sonic Boom: Rise of Lyric |
PlayStation 4, Xbox One, Nintendo Switch | Sonic Mania • Sonic Colors: Ultimate |
J2ME | Sonic the Hedgehog Mobile |
N-Gage | Sonic N |
iOS, Android | Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic the Hedgehog • Sonic the Hedgehog 2 • Sonic the Hedgehog CD |
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Racing Games |
Game Gear | Sonic Drift 2 |
Windows | Sonic R • Sonic Riders • Sonic & SEGA All-Stars Racing • Sonic & All-Stars Racing Transformed • Team Sonic Racing |
Sega Saturn | Sonic R (Preview) |
PlayStation 2 | Sonic Riders • Sonic Riders: Zero Gravity |
PlayStation 3, Wii U | Sonic & All-Stars Racing Transformed |
GameCube, Xbox | Sonic Riders |
Nintendo DS | Sonic & SEGA All-Stars Racing |
PlayStation Portable | Sonic Rivals |
Xbox 360 | Sonic & SEGA All-Stars Racing • Sonic & All-Stars Racing Transformed |
Wii | Sonic & SEGA All-Stars Racing • Sonic Riders: Zero Gravity |
Nintendo 3DS | Sonic & All-Stars Racing Transformed |
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Sports/Fighting Games |
Sega Genesis | Sonic the Hedgehog Spinball (Prototypes) |
Sega Master System | Sonic Spinball |
Game Gear | Sonic Spinball (Prototypes) |
Arcade | Sonic Championship |
Game Boy Advance | Sonic Battle |
Nintendo DS | Mario & Sonic at the Olympic Games |
Wii | Mario & Sonic at the Olympic Games • Mario & Sonic at the Olympic Winter Games • Mario & Sonic at the London 2012 Olympic Games |
Nintendo 3DS | Mario & Sonic at the London 2012 Olympic Games |
Wii U | Mario & Sonic at the Rio 2016 Olympic Games |
J2ME | Sonic at the Olympic Games |
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Puzzle Games |
Sega Genesis | Dr. Robotnik's Mean Bean Machine (Prototypes) |
Sega Master System, Game Gear | Dr. Robotnik's Mean Bean Machine |
Arcade | SegaSonic Bros. |
Adobe Flash | Sonic Jigsaw 2 • Sonic Boom: Link 'n Smash |
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Educational Games |
Sega Master System | Sonic's Edusoft |
Windows | Sonic's Schoolhouse |
Sega Pico | Sonic the Hedgehog's Gameworld • Tails and the Music Maker (Prototypes) |
Leapster | Sonic X |
LeapFrog Didj | Sonic the Hedgehog |
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Compilations |
Sega Genesis | Sonic Classics |
Sega Saturn | Sonic Jam (Prototype) |
Windows | Sonic & Knuckles Collection |
GameCube | Sonic Mega Collection (Prototype) • Sonic Gems Collection |
PlayStation 2 | Sonic Gems Collection |
Nintendo DS | Sonic Classic Collection |
Game.com | Sonic Jam |
Plug & Play | Super Sonic Gold |
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Other |
Game Gear | Tails' Skypatrol • Tails Adventures |
Arcade | SegaSonic Cosmo Fighter |
Dreamcast | Sonic Shuffle (Debug Version) |
Nintendo DS | Sonic Chronicles: The Dark Brotherhood |
J2ME | Sonic Jump |
iOS, Android | Sonic Jump • Sonic Dash • Sonic Runners • Sonic Runners Adventure (Prototype) |
Adobe Flash | Sonic The Broad Jump • Sonic and the Black Knight: Knight in Training |