Not to be confused with Planks.
The Plank Lock is a "lock" on the Main Door. It can be knocked down by the Hammer to unlock that portion of the door. When done so, it makes a noise that alerts Granny. And the Plank Lock will be at the Main Door in every difficulty.
The Player has to use the Hammer twice to knock down both sides of the Plank Lock. However, if the Plank Lock will also fall if the Player uses the Hammer two times on the left side of the Plank Lock. When it falls, it will make noise, alerting Granny.
- The right side of the Plank Lock will always fall first, allowing for the trick mentioned above.
- It is the only plank in the game that can't be picked up.