http://www.deadlygameschildrenplay.com/en/home.asp
There is just one article on this subject. It'll give you chills, especially if you have a child in this age bracket, which I do. The two that were lost here to this were acquaintances of his and it kind of fucked him up.
One used a belt and tied it to a doorknob and sat down, to give himself a rush..... but before he could get his rush high enough to suit him, he passed out and died.
The other girl used a sheet and tied it to something in her home, they won't say what, and she died as well.