Breach is a hazardous object which is encountered in 'Eye' levels of the game.
Breach looks like an eye looking into a rift in the wall. The eye blinks and moves its pupil continiously. When player is in a room with the breach, the audible sound of blowing wind is heard. Breach occupies one room area and is seen in the middle of its (room's) back wall.
Breach provides opportunity for Seeking Guests to get in the house. A floor with a breach on it will have at least one Seeking Guest. Other floors will have a chance to have a Guest on them too. If a Guest despawns (e.g. gets the player), breach will call another one in a short period of time. Hiding Guests do not need a breach to appear.
When a breach appears, screen zooms in on the room where the breach is about to spawn (the light is beeing broken no matter whether it's on or off) and lightning strikes. After approximately 10 seconds from this event, a breach appears. The moment a breach spawns a door will usually slam shut on the floor where Guest is going to be.
A player can seal a breach by fixing the light in the room where it spawns. When a breach is sealed, time runs backwards a little bit (like touching a Hiding Guest). Once the breach is sealed, it will re-open somewhere else in the house in after brief period of time.
An 'Eye' level can have up to 3 breaches active at the same time. It is possible to pass this kind of level without any breaches opening at all; it happens if the Lodger manages to see a lot of Clocks which leads to a fast win.
Timers which are used for breaches' opening/reopening do not depend on the game time but on the real one.
If the Lodger interacts with a breach, he will be sent into the Hallway.