Unlicensed developers and fans have created unofficial Sonic media, especially video games, relating to the Sonic the Hedgehog franchise.
These products include video games, video game mods, ROM hacks, comics, and animations.
Due to the popularity of the franchise, some of these products have received media attention.
Sega is permissive of most fangames, as long as they are not for profit.
The following are all original games based on the Sonic series: The following are unofficial ports of Sonic games for various systems: The following are some of the modified versions of existing Sonic games, created using special programs and utilities.