"Turn them back on!" as Jacques would say in Treasure in the Royal Tower as Nancy (you) flick on and off the switch in the circuit breaker.
Come on Jacques! One of the best ways to enhance your game-playing experience would be to turn off the lights! If you have played Shadow at the Water's Edge, you would totally understand this Nancy Drew Moment:
But in some cases, like the scarier mysteries, perhaps playing with the lights out would not be such a good idea if you'd rather not be more prone to jumping out of your chair and potentially hitting something with flailing arms as you scream at the top of your lungs.
Just a thought.