I started playing this Starcraft 2 custom game called "Mafia" and GOD DAMN, I can not stop playing it! This game is so addictive and fun.
It's basically a party game. I think it started out as a game that you play IRL with a group of 10 or so people.
The game consists of 12-15 people and some of those people, usually three, are Mafia. The rest of the people are Town or Neutral. Mafia's objective is to kill all of the Town. Town's objective is to lynch or otherwise kill all the Mafia members. Neutrals have various objectives which I will go into later.
There are many roles in the game for each faction. For example, Town has Doctors, Sheriffs, Investigators, Jailors and many other roles. Mafia has the Godfather, Framer, Blackmailer, etc. These roles are chosen at the beginning of the game. Some roles are randomized so you're not exactly sure what roles people actually have in the game. No one knows what role anybody else is, except the Mafia.
The game has a day/night cycle. During the Day you can talk to all the other people in the game. You can also decide on who you want to vote for to lynch. If a person gets enough votes, they go on trial. During the trial the person on the stand can defend themselves verbally. Usually by revealing their actual roles or giving information that other people may know to be correct. If the majority decides to lynch someone then that person is killed and it goes to Night. If there is no consensus on who to put on trial, the day will end when time has run out.
During the Night, people can carry out their roles abilities. Mafia's Godfather, for example, can choose to kill one person every night. The Blackmailer can choose one person to silence for the entire next day. The Town roles like Sheriff can check one person each night to see if they are Mafia, or Town. The Doctor can heal one person and if that person would have otherwise died that night, they won't.
Then there is the Neutrals. The Neutrals include: Serial Killer, Arsonist, Witch, Survivor, Amnesiac, Jester, Cultist, and Executioner. They all have different goals. The Serial Killer is the most common Neutral role and their goal is to be last person alive. The Serial Killer has the ability to kill one person every night, and he can kill Mafia or Town.
This game is so fun. Sometimes you die on the first night which sucks, but if you live to the end you need to be smart because everyone lies in this game. As Town you need to figure out who is lying and who is not, which can be very hard. But if you have enough evidence to support your case all you can do is trust yourself and your own judgement.
Anyway, I wrote way more than I intended too. If you have SC2 and want to play Mafia, my name on BNet is Spetsnaz. See you there!