Many of you will have already played this, it's also known as assasin.
First i'm going to explain how the game works then i'm going to ask for a number of players to sign up.
Gameplay:I will give each of the players a role via PM. You will either be a
Mafia or a
townsfolk.
The Mafia will know who eachother is, but none of the townsfolk know who the mafia is.
There are 2 stages,
Day and
Night
DayDuring the day any townsperson can accuse anyone one else of being the mafia. Basically someone makes an accusation and someone else seconds it. I will call on everyone to vote on the first successful accusation. The accused may also defend themselves after i say so.
Eg:
Bob accuses Jerry
Mary seconds it
I will allow the accused to make a statement
Jerry gets to defend himself
A vote on Jerry's life is taken by everyone, majority rules.
The day ends when someone dies.
NightWhen the day is over I will say that it is night. During the night the
Mafia send me a PM saying who they would like to kill. Again it is a majority vote, however the mafia can communicate with eachother
PRIVATELY on who they want to kill.
During the night phase you can all chat in the forum until i announce the new day... and someone will have died!

How to win?The townsfolk win when all the mafia are dead. The mafia win when they become the majority of the town (They start off at about 30% of the population)
So if 9 people are playing, there will be 3 mafia. It is the mafias job to lie and decieve people in the public forum into believing that other people are the mafia.
ExampleThere are 9 people playing, 3 mafia.
During the night the mafia elect to kill 1 person.
There are now 8 people playing with 3 mafia.
During the day a vote is called on one of the townspeople.
Everyone agrees that that person is the mafia.
That person is executed.
The vote was accurate, there are now 2 mafia in a town of 7 people.
And the game goes on like that with me narrating all the events with elaborate stories.
To play simply place your name in this thread. You need to make up an Occupation for yourself to make the game extra fun.
Feel free to ask any questions, I need 9 people to start the game and you will all be given your roles via PM.
You can also read about the actual party game here:
http://en.wikipedia.org/wiki/Mafia_(game)