The Joy of Creation: Reborn (Demo) Edit
Keyholes are used to look into the hallways which Bonnie and Freddy appear in and enter the Living Room from. They can be used to monitor Freddy's and Bonnie's progress and to plan ahead of them.
The Joy of Creation: Reborn (Full) Edit
The keyhole mechanic is reintroduced in the Living Room of the full version story mode. Unlike the demo, only one animatronic can be monitored through a keyhole, Ignited Bonnie, which appears in the hallway behind the double doors, while Freddy and Foxy are monitored via the TV and can be paused individually to avoid both entering at one time.