On this difficulty, three additional locks are added to the Main Door; requiring the Player to find the Battery to unlock the Battery Lock, and the Padlock Code to unlock the Numbered Padlock. The final lock is unlocked by using the Screwdriver on a panel in the Backyard, which is near the door and the Shed, and pulling the Secret Lever within.
On this difficulty, two additional locks are added to the Main Door. The first lock is unlocked by using the Battery and the second requires the Player to deactivate a switch located in the Backyard by using the Screwdriver on a panel that can be found near the door.
On this difficulty, Extra Locks only adds a single lock to the Main Door, that being the lock that requires the Player to use the Screwdriver on a panel found in the Backyard, which is near the door, and pulling the Secret Lever within.
On Extreme difficulty, Extra Locks cannot be removed.
- Extra Locks has a smaller effect if the difficulty is higher than if it is lower.
- Extra Locks has no effect on Extreme Mode.
- This is the only way to spawn the Secret Lever.
- With Extra Locks on at any difficulty, there are 7 locks on the Main Door.
- This has virtually no effect if the Player chooses to escape via the Car.