Sonic Generations for the Nintendo 3DS is the only portable and only Nintendo variant of the hedgehog's 20th anniversary game, featuring a different selection of levels and gameplay styles than the console version.
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Unused Graphics
Green Square
A little 16x16 green square, found in Emerald Coast Act 1's foreground assets. Not much information can be gleaned from its visual appearance, but its internal name is "test".
E3 Demo Leftovers
| To do: Bottom screen, the rest of the E3 leftovers. |
A bubble that reads "Coming late 2011" that was used in the E3 2011 demo build at the end of the demo.
1990 Label
A 1990 label is stored among the collection room assets. In the collection room, year labels are used on box arts, but because no Sonic game released in 1990, this goes unused.
Debug Fonts
DebugFont
DebugFontTerminal
"DebugFont" and "DebugFontTerminal" are stored in the System directory. The font normally used by the game is named "system_font_12_03", and is located in a separate Font directory.
3D Test Images
DSCF0029Tex.tga

DSCF0188Tex.tga

DSCF0196Tex.tga

DSCF0223Tex.tga

4 CTPK files can be found in the game's System folder. They contain various images of Sonic, taken at 2 angles to test the 3DS' stereoscopic 3D capabilities. Some of these angles are very slight, while others are quite extreme, providing different levels of depth.
Test/Early UI Elements
Under the LAYOUT_X/TEST_LYT folder there are 2 files for the UI.
1ST_02_U_00
This appears to contain assets for an early boost gauge, due to the prefix 'sgage' on most of the images.

TEXTTEST
This is made up of 2 assets, a small sprite with Japanese text which translates to "Return", and a screenshot of an early pause menu.
Early |
Final
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Pause Menu Changes
- The early menu is more transparent allowing you to see the UI behind it better.
- The early menu has a slight gradient while the final uses solid colours.
- The buttons and text are much larger in the early pause menu.
- The early menu lacks button prompts.
- Background shapes are either laid out differently or changed their density in circles and details.
- In the earlier screenshot the life icon is at the very top of the screen, and a Japanese character is on the Sonic icon, likely indicating a placeholder. Lives are also set to 99, probably for testing.
- The "Start" and "Goal" indicators had many details in the early version, but was reduced to just the text in the final version.
Unused Models
SkySphere
This model can be found in the System directory alongside other test files. It's a simple sphere with large markers denoting the 3 axes (x,y,z).
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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 • 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 |
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 |
PlayStation 5, Xbox Series X | Sonic Origins • Sonic Frontiers |
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 • 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 |
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 |
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 |