SegaSonic  Stories based on the Sonic the Hedgehog games.
SatAM/Archie Sonic  Stories based on the Sonic Saturday morning cartoon, as well as the Archie Sonic comic.
Sonic Underground  Stories based on Sonic Underground, the last DiC produced Sonic cartoon.
Crossovers  What would happen if Sonic met Super Mario? What if Sonic played the hero of Indiana Jones? These are stories in which you can find out.
Non-Sonic  Have a story from a different fandom you'd like to share? Go for it! However, don't make it a habit to overflow this place with non-Sonic stories.