My idea

OK, so I've got this idea for a game, and it's probably lame, but here goes...

You're running around a level that has lights on it. Some are lit, some are not. You cast a small amount of light yourself. There's evil things in the level, and they don't like the light. They can turn off the lights, and that's what they want to do. If they catch you, then you're in trouble. Your job is to turn all the lights on. And keep them on. I think. :)