The S Factor: Sonia and Silver
About the Game
The S Factor: Sonia and Silver is a hack based on the Sonic the Hedgehog series. The chief antagonist, Dr. Robotnik, aka Eggman, is up to his nefarious designs in his quest for global domination. Sonic and his friends stand in their way as the glimmer of hope to save their world, Mobius, from the pollution and factory complexes built by Eggman and his army.ย
This is a fan-made ROM hack based on Sonic the Hedgehog for the Sega Genesis / Mega Drive. The project was created by Selbi and replaces Sonic with Sonia and Silver as the playable characters. It is an unofficial fan project and is not affiliated with Sega.
The hack keeps the original story and stage progression while introducing new playable characters with their own abilities.
๐ฆ Play as Sonia or Silver
The main feature of The S Factor is its two playable characters.
You can choose between:
- Sonia โ Sonic's sister from the animated series Sonic Underground.
- Silver โ The hedgehog from the future who first appeared in Sonic the Hedgehog (2006).
Each character has unique movement abilities that differ from Sonic's standard moveset.
๐ด The Original Sonic Adventure
The hack follows the same campaign as the original Sonic the Hedgehog.
You travel through:
- Green Hill Zone
- Marble Zone
- Spring Yard Zone
- Labyrinth Zone
- Star Light Zone
- Scrap Brain Zone
- Final Zone
Your objective remains to stop Dr. Robotnik and rescue the animals trapped inside Badniks.
โก Character Abilities
Unlike the original game, The S Factor gives its playable characters their own movement skills.
Confirmed abilities include:
Sonia
- Double Jump
Silver
- Teleport Dash
- Hover
These abilities create new ways to move through familiar stages while keeping the original level layouts.
๐จ A Character-Focused ROM Hack
The S Factor does not redesign the game's story.
Instead, it focuses on replacing Sonic with two different characters and adapting gameplay around their abilities.
| Feature | Original Sonic the Hedgehog | The S Factor: Sonia and Silver |
|---|---|---|
| Base Game | Sonic the Hedgehog | Sonic the Hedgehog |
| Story | Original | Original |
| Playable Characters | Sonic | Sonia and Silver |
| Levels | Original | Original |
| Character Abilities | Sonic's moves | Unique abilities for Sonia and Silver |
๐ฎ EmulatorJS Controls
Keyboard Controls
- Arrow Keys โ Move
- Z โ Jump
- X โ Character ability (where applicable)
- Enter โ Start
- Backspace โ Mode
Mobile Controls
- Virtual D-Pad โ Movement
- On-screen action button โ Jump and character ability
- Start button โ Pause/Menu
Controls may vary depending on your EmulatorJS configuration.
๐ Quick Facts
| Feature | Details |
|---|---|
| Base Game | Sonic the Hedgehog |
| Platform | Sega Genesis / Mega Drive |
| Type | ROM Hack |
| Creator | Selbi |
| Playable Characters | Sonia and Silver |
| Story | Original Sonic the Hedgehog |
| Official Sega Release | No |
