How to Extinguish Candles
The candles only go out if you find an object that has changed its appearance from its original look and you use the camera to take a picture of it.
As a couple of examples, sometimes the loaf of bread on the counter changes into something else or the shape of the radiators gets smaller or larger.
It’s hard in the beginning to see the changes but you get used to seeing the changes the more you play.
P.S. So if you see three candles lit, it means that somewhere in the house there have been three changes.