| Aka: | The S-Factor |
| Console: | Sega Genesis |
| TV Standard: | Region Not Set |
| Developer(s): | Sega, Sonic Retro |
| Publisher(s): | Sega |
| Release Date: | 2007-04-12 |
| Players: | 1 |
| Co-op: | No |
| ESRB: | E - Everyone |
| Type: | Action, Platform, Unofficial |
The S-Factor: Sonia & Silver is a ROM hack of Sonic the Hedgehog by Aquaslash & Pals. The game features Sonic's sister, Sonia the Hedgehog (from the DIC cartoon, Sonic Underground); Future psychic, Silver the Hedgehog (who first appeared in Sonic '06); as well as an evil version of Sonic named Scourge the Hedgehog (from the Archie Comics series) joining forces to take down a descendent of Dr. Eggman, named Eggman Nega (Who first appeared in Sonic Rush).
The hack features all-new levels as well as different movesets for each playable character (Except for Scourge who plays identically to Sonic). Sonia can accelerate into a whirlwind tornado or hit enemies with a spinning axe kick, While Silver can use his psychokinesis to throw objects at enemies.
![Gargoyles [Limited Run Games]](https://gm.egamedb.com/gargoyles-limited-run-games-sega-genesis-fct.jpg)
![Worms [Limited Run Games: Peach Edition]](https://gm.egamedb.com/worms-limited-run-games-peach-edition-sega-genesis-fct.jpg)
