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Proto:Sonic the Hedgehog 4: Episode I

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This page details one or more prototype versions of Sonic the Hedgehog 4: Episode I.

Hmmm...
To do:
  • Xbox 360 builds from February 6 and 8 have also been released.

Sonic the Hedgehog 4 - Episode I had... an interesting development cycle, to say the least. Five prototypes exist; the first two are for the Xbox 360 and were recovered from development kits, while the last three are all dated the same day and were made for the Xbox 360, PlayStation 3, and Wii, and were also rather infamously all leaked before/during the game's release cycle.

Sub-Pages

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 February 6, 2010 Prototype
The first of them!
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 February 8, 2010 Prototype
Before the infamous PartnerNet build.
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 February 9, 2010 Prototypes
Ingenious! How can we release three prototypes in one? Does this say that the game is coming out in February?
v · t · e
Sega GenesisSonic 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 SystemSonic the Hedgehog • Sonic the Hedgehog 2 • Sonic Chaos (Prototypes) • Sonic Blast
Game GearSonic the Hedgehog (Prototype) • Sonic the Hedgehog 2 (Prototype) • Sonic Chaos (Prototypes) • Sonic Triple Trouble (Prototypes) • Sonic Labyrinth • Sonic Blast (Prototypes)
ArcadeSegaSonic the Hedgehog (Prototype)
Sega CDSonic the Hedgehog CD (Prototypes‎)
32XKnuckles' Chaotix (Prototypes)
WindowsSonic the Hedgehog CD (1996) • Sonic 3D Blast • Sonic Heroes (Prototypes) • Sonic Adventure DX: Director's Cut (2004) (Demo) • Sonic the Hedgehog 4: Episode I • Sonic the Hedgehog CD (2011) • Sonic Adventure DX: Director's Cut (2011)  • Sonic Generations (Demos) • Sonic the Hedgehog 4: Episode II (Prototype) • Sonic Adventure 2 • Sonic Lost World • Sonic Mania • Sonic Forces • Sonic Colors: Ultimate • Sonic Frontiers • Sonic Superstars • Sonic X Shadow Generations
Sega SaturnSonic X-treme • Sonic 3D Blast (Prototype)
DreamcastSonic Adventure (Prototypes) • Sonic Adventure 2 (Prototypes)
Neo Geo Pocket ColorSonic the Hedgehog Pocket Adventure (Prototypes)
GameCubeSonic Adventure 2: Battle (Demo) • Sonic Adventure DX: Director's Cut (Prototypes) • Sonic Heroes (Prototypes) • Shadow the Hedgehog
Game Boy AdvanceSonic Advance (Prototype) • Sonic Advance 2 (Prototype) • Sonic Advance 3 (Prototype) • Sonic the Hedgehog Genesis
PlayStation 2Sonic Heroes (Prototypes) • Shadow the Hedgehog • Sonic Unleashed
XboxSonic Heroes (Prototypes) • Shadow the Hedgehog
DoJa, J2ME, BREWSonic the Hedgehog • Sonic the Hedgehog 2
N-GageSonic N
Nintendo DSSonic Rush (Demo) • Sonic Rush Adventure • Sonic Colors (Demo)
Xbox 360Sonic the Hedgehog (Prototypes) • Sonic Unleashed (Prototypes) • Sonic Adventure DX: Director's Cut (Prototypes) • Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic Generations (Demos) • Sonic the Hedgehog CD (2011) (Demo) • Sonic the Hedgehog 4: Episode II • Sonic Adventure 2
WiiSonic Unleashed • Sonic Colors • Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic and the Secret Rings • Sonic and the Black Knight
PlayStation 3Sonic the Hedgehog • Sonic Unleashed • Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic Generations (Demos) • Sonic the Hedgehog CD (2011) (Demo) • Sonic the Hedgehog 4: Episode II • Sonic Adventure 2
Nintendo 3DSSonic Generations • Sonic Lost World
Wii USonic Lost World
PlayStation 4, Xbox One, Nintendo SwitchSonic Mania • Sonic Forces (Demo)  • Sonic Colors: Ultimate • Sonic Frontiers • Sonic Superstars • Sonic X Shadow Generations
Amazon LunaSonic Mania • Sonic Colors: Ultimate
PlayStation 5, Xbox Series XSonic Frontiers • Sonic Superstars • Sonic X Shadow Generations
iOS, Android, tvOSSonic the Hedgehog 4: Episode I (Prototypes) • Sonic the Hedgehog 4: Episode II (Prototype) • Sonic the Hedgehog • Sonic the Hedgehog 2 • Sonic the Hedgehog CD (Demo)
Ouya, NVIDIA ShieldSonic the Hedgehog 4: Episode I (Prototypes) • Sonic the Hedgehog 4: Episode II (Prototype) • Sonic the Hedgehog CD (Demo)
Racing Games
Game GearSonic Drift • Sonic Drift 2
WindowsSonic R • Sonic Riders • Sonic & SEGA All-Stars Racing • Sonic & All-Stars Racing Transformed • Team Sonic Racing
Sega SaturnSonic R (Preview)
PlayStation 2Sonic Riders (Prototype) • Sonic Riders: Zero Gravity
PlayStation 3, Wii USonic & All-Stars Racing Transformed
GameCube, XboxSonic Riders
Nintendo DSSonic & SEGA All-Stars Racing
PlayStation PortableSonic Rivals • Sonic Rivals 2
Xbox 360Sonic & SEGA All-Stars Racing • Sonic & All-Stars Racing Transformed • Sonic Free Riders
WiiSonic & SEGA All-Stars Racing • Sonic Riders: Zero Gravity
Nintendo 3DSSonic & All-Stars Racing Transformed
PlayStation 4, Xbox One, Nintendo Switch, Amazon LunaTeam Sonic Racing
Adobe FlashSonic Rivals Dash
Sports/Fighting Games
Sega GenesisSonic the Hedgehog Spinball (Prototypes)
Sega Master SystemSonic Spinball
Game GearSonic Spinball (Prototypes)
ArcadeSonic Championship • Mario & Sonic at the Rio 2016 Olympic Games
Game Boy AdvanceSonic Battle
Nintendo DSMario & Sonic at the Olympic Games • Mario & Sonic at the Olympic Winter Games
Xbox 360Sonic the Fighters
WiiMario & Sonic at the Olympic Games • Mario & Sonic at the Olympic Winter Games • Mario & Sonic at the London 2012 Olympic Games
Nintendo 3DSMario & Sonic at the London 2012 Olympic Games
Wii UMario & Sonic at the Rio 2016 Olympic Games
J2MESonic the Hedgehog Golf • Sonic at the Olympic Games • Sonic Spinball
BREWSonic at the Olympic Games • Sonic Spinball
Puzzle Games
Sega GenesisSonic Eraser • Dr. Robotnik's Mean Bean Machine (Prototypes)
Sega Master System, Game GearDr. Robotnik's Mean Bean Machine
ArcadeSegaSonic Bros.
Adobe FlashSonic Jigsaw 2
Educational
Sega Master SystemSonic's Edusoft
WindowsSonic's Schoolhouse
Sega PicoSonic the Hedgehog's Gameworld (Prototypes) • Tails and the Music Maker (Prototypes)
LeapsterSonic X
LeapFrog DidjSonic the Hedgehog
Sonic Boom
Wii URise of Lyric (Prototype)
Nintendo 3DSShattered Crystal • Fire & Ice
Adobe FlashLink 'n Smash
Compilations
Sega GenesisSonic Classics
Sega SaturnSonic Jam (Demo)
WindowsSonic & Knuckles Collection • Sonic Mega Collection Plus • Sonic Origins
GameCubeSonic Mega Collection (Prototype) • Sonic Gems Collection
PlayStation 2Sonic Mega Collection Plus • Sonic Gems Collection
XboxSonic Mega Collection Plus
Nintendo DSSonic Classic Collection
Xbox One/Series X, PlayStation 4/5, Nintendo SwitchSonic Origins
Game.comSonic Jam
Plug & PlaySuper Sonic Gold
Other
Game GearTails' Skypatrol • Tails Adventures
ArcadeSegaSonic Cosmo Fighter
Sega SaturnSonic the Hedgehog into Dreams...
DreamcastSonic Shuffle (Debug Version)
Nintendo DSSonic Chronicles: The Dark Brotherhood
Windows, Mac OS XThe Murder of Sonic the Hedgehog
J2MESonic Jump (2005) • Sonic Jump (2007)
iOS, AndroidSonic Jump • Sonic Dash • Sonic Runners • Sonic Runners Adventure (Prototype)
Adobe FlashSonic the Broad Jump • Sonic and the Black Knight: Knight in Training
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