There are a handful of known Prototypes in existence for Fur Fighters. They are:
- Furballs - The earliest known prototype, owned by Mark Craig. Features a completely different engine, and only has 3 playable characters - Roofus, Juliette and Bungalow.
- Fur Fighters Dreamcast Prototype - A prototype owned by RadSpyro. Features a unique exit to The Bad Place, as well as several other minor differences.
- Fur Fighters PC Debug - Debug prototypes owned by YouTuber Resolute. Includes the debug mode on what is otherwise the final game.