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Sonic the Hedgehog was the second of two Sonic games released for LeapFrog systems, following Sonic X, and like its predecessor contains educational aspects (in this case, spelling).
Unlike Sonic X, which was a reskin of another game, the Didj's Sonic title couches the educational stuff in more or less a "Greatest Hits" of the Genesis-era Sonic games: numerous graphics, sounds, enemies, and items are pretty much lifted directly from those titles, as is the gameplay. One big difference is that the Special Stage rings take Sonic to the spelling challenges; the Chaos Emeralds (of which there are only three) are instead awarded for beating bosses, with the final boss giving up the Master Emerald.
Oh, and Sonic has blue eyelids.
- There's unused levels, but we need a way to access and view them.
- Any more unused graphics?
- Any more unused audio?
- Find a way to access Debug Mode.
Sonic walking and running diagonally. In-game, his jumping/rolling sprites are used for diagonal movement instead.
While most of Sonic's sprites in this game are based on those from Sonic the Hedgehog 3, these are instead lifted from Sonic 2 despite equivalent sprites existing in Sonic 3.
Both walking animations have one frame where the sprites are dislodged from their intended maskings.
A version of Sonic's standing frame edited to make him look down. Amusingly, only his right eye was edited, making him look almost cross-eyed. One pixel of the mask is visible on the sprite.
Sonic hanging from something, unused because there's nothing to hang on in this game. Notably, this also uses sprites from Sonic 2 despite equivalent Sonic 3 sprites existing.
Sonic celebrating. If this looks familiar, it's because it's part of the unused celebration animation from Sonic 1!
Confirm if this is really unused. There are sections of water in the game.
The Sonic 3 drowning sprite.
A debug font that's used in Debug Mode.
A version of the HUD (taken from Sonic 1) without the Gadgets icon.
Sonic's life counter icon without the text, suggesting that "SONIC" and the X symbol were separate sprites at one point. The final game stores it all as one sprite, likely for optimization.
Emerald Hill Zone's background from Sonic 2, meant for the title screen (not the first time it was swapped out later in development). The title screen instead uses part of Emerald Hill Act 2 as the background.
Notably, a version of this background is used in the game's preview icon.
A blue background, purpose unknown. Could be a placeholder for the menu background.
Check if there is any leftover unused code behaviors?
A blank monitor. Similar to the used version but with the top being a bit taller, to be used alongside...
...these numbersǃ It would seem like the game was planned to feature math-related Special Stages in addition to spelling ones.
Here’s what it looks like assembled.
An unused version of the game's icon that's quite poorly resized and uses a brighter background.
||Green Hill Zone from Sonic 1.
||Chemical Plant Zone from Sonic 2.
||Scrap Brain Zone, also from Sonic 1. The final game has this and Chemical Plant represented in one level, but these icons indicate they were separate levels at one point.|
Oddly, the icon is a bit off-center.
||Hydrocity Zone from Sonic 3, also a bit off-center.
An alternate version of the sound used when Sonic loses rings.
|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|
|iOS, Android||Sonic the Hedgehog 4: Episode I (Prototypes) • Sonic the Hedgehog • Sonic the Hedgehog 2 • Sonic the Hedgehog CD|
|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|
|Sega Genesis||Sonic the Hedgehog Spinball (Prototypes)|
|Sega Master System||Sonic Spinball|
|Game Gear||Sonic Spinball (Prototypes)|
|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|
|Sega Genesis||Dr. Robotnik's Mean Bean Machine (Prototypes)|
|Sega Master System, Game Gear||Dr. Robotnik's Mean Bean Machine|
|Adobe Flash||Sonic Jigsaw 2 • Sonic Boom: Link 'n Smash|
|Sega Master System||Sonic's Edusoft|
|Sega Pico||Sonic the Hedgehog's Gameworld • Tails and the Music Maker (Prototypes)|
|LeapFrog Didj||Sonic the Hedgehog|
|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|
|Plug & Play||Super Sonic Gold|
|Game Gear||Tails' Skypatrol • Tails Adventures|
|Arcade||SegaSonic Cosmo Fighter|
|Dreamcast||Sonic Shuffle (Debug Version)|
|Nintendo DS||Sonic Chronicles: The Dark Brotherhood|
|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|