Are you looking for a few good games for sleepovers?
A good one for teens is to go to a graveyard (at night obviously) and stick a knife in front of the head stone in the creepiest looking grave you can find, and then lay down on the grave with the knife still there.
The point of the game is to lay there for around five minutes and being able to stand up and honestly say that you did not feel a knot in the pit of your stomach. I have not been able to do it yet. It is best to do this game when it is a little cold outside because people are more on edge when it is cold out.
Another fun thing to do for teens is mess with an Ouija board. It always gives a good scare. It is kind of difficult to explain how to do it so your best bet would be to look it up online, but I am very sorry that I can't explain it. Another fantastic game for teens is the Bloody Mary game.
What you do is you go to the bathroom, close the door, and turn off the lights. You look into the bathroom mirror and say "Bloody Mary. Bloody Mary. Bloody Mary..." You are supposed to be able to see a woman who is wearing a white dress, and she is covered in blood.
If the bathroom is pitch black, I always like to have a sibling or a parent hide in the bathroom, come out as quietly as possible when the lights are off and the door is closed, and when you are all done saying your Bloody Mary's, the sibling or parent reaches out and grabs someone's arm (make sure they get a firm grip.
Not hard enough to hurt them, but hard enough that they can't pull away). You are guaranteed to get a scream. It is a blast. These games really only work on people who believe in ghosts and demons and stuff like that. But either way, they are a lot of fun.