This page details one or more prototype versions of Sonic the Hedgehog (Sega Master System, Game Gear).
This prototype is documented on Hidden Palace.
| To do: Access and investigate other zones. Try to import art of the respective zones from the original game. |
Porting from one system to another can sometimes be tough, as seen with the Game Gear prototype of Sonic the Hedgehog.
General Differences
Prototype |
Final |
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- There is no Sega logo in the beginning, just like the Master System version.
- Act 1 of Green Hill Zone is the only playable stage by normal means. However, Act 2 can be accessed with hacking by using a hex editor and going to offset 155FE and changing C4 to B6. Also, by using level modifier codes, it's possible to play other stages, but most either crash, are empty, or are missing their art.
Prototype |
Final |
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- The map screen has misplaced points and different smoke graphics. It also uses a similar color palette to the Master System version.
Prototype |
Final |
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- Sonic is placed further right at the start of the level.
- Sonic's palette changes to a darker blue when nearing the signpost; in the final version, he becomes ever so slightly brighter.
- A strange strip appears at the top of the level briefly. Just a graphical glitch as touching it does nothing.
Prototype |
Final |
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- The invincibility stars are more similar to the Master System version. The final game has four stars.
- Sonic's sprites are nearly identical to the Master System version, with some minor palette alterations.
Prototype |
Final |
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- Various things have yet to be added to accommodate the smaller screen size, such as warning signs near spike pits.
- The level layout is slightly different compared to the other versions.
Prototype |
Final |
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- Totem poles have three heads in the prototype, while in the final, they only have two.
Prototype |
Final |
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- The mountain range has a similar hue to the Master System version.
Prototype |
Final |
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- The Game Over screen is messed up due to some tile rearrangement.
- The credits are still in the ROM. Aside from a messed-up palette, it's 100% identical to the Master System version.
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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) • Sonic 3D Blast • Sonic Heroes • Sonic Adventure DX: Director's Cut (2004) (Demo) • Sonic the Hedgehog CD (2011) • Sonic Adventure DX: Director's Cut (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 • Sonic Frontiers |
Sega Saturn | Sonic X-treme • Sonic 3D Blast (Prototype) |
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 (Prototype) • Sonic Advance 3 (Prototype) • Sonic the Hedgehog Genesis |
PlayStation 2 | Sonic Heroes • Shadow the Hedgehog • Sonic Unleashed |
Xbox | Sonic Heroes • Shadow the Hedgehog |
J2ME | Sonic the Hedgehog |
N-Gage | Sonic N |
Nintendo DS | Sonic Rush (Demo) • Sonic Rush Adventure |
Xbox 360 | Sonic the Hedgehog (Demo) • Sonic Unleashed (Preview) • Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic Generations (Demos) • Sonic Adventure DX • 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 DX • Sonic Adventure 2 • Sonic Generations (Demos) • Sonic the Hedgehog CD (2011) |
Nintendo 3DS | Sonic Generations • Sonic Lost World |
Wii U | Sonic Lost World |
PlayStation 4, Xbox One, Nintendo Switch | Sonic Mania • Sonic Colors: Ultimate • Sonic Frontiers |
Amazon Luna | Sonic Colors: Ultimate |
PlayStation 5, Xbox Series X | Sonic Frontiers |
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 • 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 • Sonic Rivals 2 |
Xbox 360 | Sonic & SEGA All-Stars Racing • Sonic & All-Stars Racing Transformed • Sonic Free Riders |
Wii | Sonic & SEGA All-Stars Racing • Sonic Riders: Zero Gravity |
Nintendo 3DS | Sonic & All-Stars Racing Transformed |
Adobe Flash | Sonic Rivals Dash |
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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 • Mario & Sonic at the Olympic Winter 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 | Sonic Eraser • 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 |
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Educational Games |
Arcade | SegaSonic Cosmo Fighter |
Sega Master System | Sonic's Edusoft |
Windows | Sonic's Schoolhouse |
Sega Pico | Sonic the Hedgehog's Gameworld (Prototypes) • Tails and the Music Maker (Prototypes) |
Leapster | Sonic X |
LeapFrog Didj | Sonic the Hedgehog |
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Sonic Boom |
Wii U | Rise of Lyric |
Nintendo 3DS | Shattered Crystal • Fire & Ice |
Adobe Flash | Link 'n Smash |
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Compilations |
Sega Genesis | Sonic Classics |
Sega Saturn | Sonic Jam (Demo) |
Windows | Sonic & Knuckles Collection • Sonic Mega Collection Plus • Sonic Origins |
GameCube | Sonic Mega Collection (Prototype) • Sonic Gems Collection |
PlayStation 2 | Sonic Mega Collection Plus • Sonic Gems Collection |
Xbox | Sonic Mega Collection Plus |
Nintendo DS | Sonic Classic Collection |
Xbox One, Xbox Series X, PlayStation 4, PlayStation 5, Nintendo Switch | Sonic Origins |
Game.com | Sonic Jam |
Plug & Play | Super Sonic Gold |
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Other |
Game Gear | Tails' Skypatrol • Tails Adventures |
Sega Saturn | Sonic the Hedgehog into Dreams... |
Dreamcast | Sonic Shuffle (Debug Version) |
Nintendo DS | Sonic Chronicles: The Dark Brotherhood |
Windows, Mac OS X | The Murder of Sonic the Hedgehog |
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 |