The Secret Rabbit Hole
The Rabbit Hole Location
The rabbit hole is located in the tunnel that you enter with Freddy early on in the game. Its in the hallway leading to the first security office.
You will need to defeat Monty and get his claws to get access to the door.
The Purpose of the Hole
There are several retro discs – ??? scattered around the map. Bring them here and there is a player on the wall.