Floor 0 is a secret floor in Pirate Caverns.
Floor 0 lies deep below the third floor. The player must find a black key on the third floor in order to get to Floor 0, using the Elevator.
The Floor consists of black brick walls and a grey floor. You can sometimes see some Mickey Heads lying around, aswell some posters on the wall.
- This Floor was originally called "Floor 4" but this was changed to be more original.
- The thread of this Floor, Zero Mouse, only appears in this Floor and not on the actual nights.
- When on this Floor, the time vanishes, so you there only stands Night 3.
- This is because you have to find the exit, instead of surviving until 6 AM.