Sonic the Hedgehog 2: Gear Shift/Running for Miles(CGS2025 DEMO)
Posted: Sat Oct 25, 2025 9:04 pm
by StarrydustNova
Sonic the Hedgehog 2: Gear Shift(previously known as Sonic 2 SMS/GG 16-Bit) or it's alternative JP subtitle: Running for Miles, is a re-imagining of Sonic the Hedgehog 2 for the Sega Master System and Game Gear, updated with 16-Bit graphics inspired by those of the likes of Sonic 2 and Sonic CD.
The goal of this project to bring out the best aspects of the original game, while correcting major issues and bringing some new ideas to the table.
This demo features 2 zones to play, Under Ground Zone and Sky High Zone!
Plot Synopsis
► Show Spoiler
Shortly following his first journey across South Island, Sonic the Hedgehog relishes in the peaceful aftermath of his encounter with Dr. Ivo Robotnik.
Some time relaxing later though, he opens one eye to find no sign of any of his flicky friends... Before he let that thought linger, the hedgehog hears something swoosh by, looking to only see Dr. Robotnik chasing after his new friend, Miles "Tails" Prower!
Try as he might, Sonic could only catch up just in time to see the mad doctor snatch his buddy and take off, only leaving a note written by the
diabolical doctor behind, taunting the hedgehog that he is holding Tails hostage in the Crystal Egg Zone in exchange for the six Chaos Emeralds!
The note also remarks that Robotnik has built a new series of robots that is awaiting to destroy the hedgehog at every turn of the island, called "Master Robots"...
After reading the note, Sonic sets out to thwart Dr. Robotnik's scheme and save his friend!
Some time relaxing later though, he opens one eye to find no sign of any of his flicky friends... Before he let that thought linger, the hedgehog hears something swoosh by, looking to only see Dr. Robotnik chasing after his new friend, Miles "Tails" Prower!
Try as he might, Sonic could only catch up just in time to see the mad doctor snatch his buddy and take off, only leaving a note written by the
diabolical doctor behind, taunting the hedgehog that he is holding Tails hostage in the Crystal Egg Zone in exchange for the six Chaos Emeralds!
The note also remarks that Robotnik has built a new series of robots that is awaiting to destroy the hedgehog at every turn of the island, called "Master Robots"...
After reading the note, Sonic sets out to thwart Dr. Robotnik's scheme and save his friend!
► Show Spoiler
► Show Spoiler
StarrydustNova - Leader, Game Design, Stage and Character Art, Level Design
_Sonc - Co-leader, Game Design, Stage and Character Art, Level Design
MichaelWave - Game Design, Stage Art, Concept Art
MarktheMaster91 - Coding
jao583 - Level Design, Coding
joshyflip - Stage and Character Art, Coding, Level Design
jtn00b - Coding
Dark - Coding
Beta Nexus - Stage Art
BlueSpeedster - Coding
Leirnabs - Coding
The_FakeFlamer - Coding
CartoonsAnimate22 - Character Art
LunarCryptik - Composer
ProjectFM - Composer
AyoImDavid - Composer, Stage Art
HazelSpooder - Game Design, Playtester
KGL - Level Design, Playtester
MeloSoni12 - Composer, Logo Designer
This doesn't list everyone who helped with the game, just those that are in the team! Please view the in-game credits
for the full credits of who helped us make this game come true! If you are any of those people, you're too cool!
_Sonc - Co-leader, Game Design, Stage and Character Art, Level Design
MichaelWave - Game Design, Stage Art, Concept Art
MarktheMaster91 - Coding
jao583 - Level Design, Coding
joshyflip - Stage and Character Art, Coding, Level Design
jtn00b - Coding
Dark - Coding
Beta Nexus - Stage Art
BlueSpeedster - Coding
Leirnabs - Coding
The_FakeFlamer - Coding
CartoonsAnimate22 - Character Art
LunarCryptik - Composer
ProjectFM - Composer
AyoImDavid - Composer, Stage Art
HazelSpooder - Game Design, Playtester
KGL - Level Design, Playtester
MeloSoni12 - Composer, Logo Designer
This doesn't list everyone who helped with the game, just those that are in the team! Please view the in-game credits
for the full credits of who helped us make this game come true! If you are any of those people, you're too cool!
► Show Spoiler
[* = Major, - = Minor]
--Version 2.0.1--(46 downloads)
* Overhauled the entire game from last year.
Simply put, it's an entirely different game, but I'll list the changes anyways.
* Title screen has received an overhaul, completing it with new animations and whatnot.
* Completely remade Under Ground Zone! Minecarts are now also way better, I promise.
* New set of sprites for Sonic, Tails, Eggman, pretty much everything.
* New SEGA Logo and Team Supernova splash screen.
* Added a data select! You may now save your progress, including any emeralds you've collected
and when you beat the demo.
* Added Sky High Zone!
* Added some hidden sound test cheats for the level select, can you find them?
--Version 2.0.2--(1,016 downloads)
* Made trigger stuff invisible as they should've been, sorry for the inconvience!
* Fixed priority issues with lava.
* Misc. other major issues have been addressed.
--Version 2.0.3--(2,200 downloads)
* Fixed major collision and visual issues for every level.
* You can no longer softlock yourself with the minecart in UGZ3.
* Visuals have been adjusted for Under Ground Zone to take up less of the level, get a nice view of that background at last!
- Tweak all collapsing ledges in UGZ to give you more time to react, hopefully...
- Updated the blue SHZ's flower palette a bit.
- Changed a couple of red springs in SHZ3 to be yellow.
* Changed extra life jingle as it was using something that I didn't have the permission to use, sorry!
--Version 2.0.4--(133 downloads)
- Added animation for lava windows in pipes for UGZ.
* Adjusted level design in UGZ to generally have better gameplay flow and sense of direction.
- Adjusted UGZ's lava palette for the FG and fixed a tile being outdated.
- Various minor decoration/tile fixes.
- Silhouette for disclaimer screen and title screen opening has been updated.
* You can now skip the CGS splash screen.
* Added dynamic window scaling for video size in the options.
* SHZ2 emerald now has another easier way to access it, other than the intended path. We're sorry to all those who had trouble getting it!
- Fixed getting hurt in lava playing an additional sound.
- Fixed the pause menu crashing the game when restarting or exiting the level too many times in quick succession
- Fixed the pause menu softlocking the controls when you try to restart on one life.
* You can now disable Time Overs. Take the levels at your own pace and explore!
* Removed Knuckles. Fuck that guy.
--Version 2.0.5--
* Added text on the title screen that tells you which version you are playing after pressing start.
- Removed the SEGA copyright text for the title screen, this is a fangame after all.
* Finally fixed the dreaded "uncurl" bug that would occur when bouncing off anything with 0 speed.
Known Issues:
Burrobros tend to hide behind level geometry when appearing, watch out!
--Version 2.0.1--(46 downloads)
* Overhauled the entire game from last year.
Simply put, it's an entirely different game, but I'll list the changes anyways.
* Title screen has received an overhaul, completing it with new animations and whatnot.
* Completely remade Under Ground Zone! Minecarts are now also way better, I promise.
* New set of sprites for Sonic, Tails, Eggman, pretty much everything.
* New SEGA Logo and Team Supernova splash screen.
* Added a data select! You may now save your progress, including any emeralds you've collected
and when you beat the demo.
* Added Sky High Zone!
* Added some hidden sound test cheats for the level select, can you find them?
--Version 2.0.2--(1,016 downloads)
* Made trigger stuff invisible as they should've been, sorry for the inconvience!
* Fixed priority issues with lava.
* Misc. other major issues have been addressed.
--Version 2.0.3--(2,200 downloads)
* Fixed major collision and visual issues for every level.
* You can no longer softlock yourself with the minecart in UGZ3.
* Visuals have been adjusted for Under Ground Zone to take up less of the level, get a nice view of that background at last!
- Tweak all collapsing ledges in UGZ to give you more time to react, hopefully...
- Updated the blue SHZ's flower palette a bit.
- Changed a couple of red springs in SHZ3 to be yellow.
* Changed extra life jingle as it was using something that I didn't have the permission to use, sorry!
--Version 2.0.4--(133 downloads)
- Added animation for lava windows in pipes for UGZ.
* Adjusted level design in UGZ to generally have better gameplay flow and sense of direction.
- Adjusted UGZ's lava palette for the FG and fixed a tile being outdated.
- Various minor decoration/tile fixes.
- Silhouette for disclaimer screen and title screen opening has been updated.
► Show Spoiler
* Completely fixed the insta-shield, you can now use it more than once, alongside other fixes.
* You can now skip the CGS splash screen.
* Added dynamic window scaling for video size in the options.
* SHZ2 emerald now has another easier way to access it, other than the intended path. We're sorry to all those who had trouble getting it!
- Fixed getting hurt in lava playing an additional sound.
- Fixed the pause menu crashing the game when restarting or exiting the level too many times in quick succession
- Fixed the pause menu softlocking the controls when you try to restart on one life.
* You can now disable Time Overs. Take the levels at your own pace and explore!
* Removed Knuckles. Fuck that guy.
--Version 2.0.5--
* Added text on the title screen that tells you which version you are playing after pressing start.
- Removed the SEGA copyright text for the title screen, this is a fangame after all.
► Show Spoiler
* ACTUALLY fixed the Insta-shield now.
* Sonic now has actual drop-dash sprites unique to this game.
* Sonic now has actual drop-dash sprites unique to this game.
* Finally fixed the dreaded "uncurl" bug that would occur when bouncing off anything with 0 speed.
► Show Spoiler
- Fixed a softlock regarding a tunnel in GHZ1.
Known Issues:
Burrobros tend to hide behind level geometry when appearing, watch out!