Sonic 1 Character Pak is a ROM hack of the original Sonic the Hedgehog for Sega Genesis, likely focused on modifications to the playable characters. This suggests that it may introduce new playable characters, altered character abilities, or changes to existing character sprites. This type of hack allows players to experiment with different character dynamics within the existing Sonic game world. The extent of the changes depends on the specific character alterations implemented in the hack.

Sonic 1 Character Pak

Sonic 1 but different sprites