A minimum of 2 players are chosen as werewolves and are not allowed to tell their role to the other players. Every night they eat one of the non-werewolf players, taking them out of the game.
The next day the villagers vote on who they think is a werewolf. Whoever gets the most votes is banished. The other players find out whether they are a werewolf or not. The player that is chosen is then out of the game, whether they were innocent or not.
One of the villagers also has a secret power which they, like the werewolves, are not allowed to tell anyone. These are called Seers. They can choose one villager at a time and see whether they are a werewolf or not. If they find a werewolf they have to try and convince the other players to vote for that person without giving their role away.
This cycle repeats until either all the werewolves have been found or all the villagers have been eaten.
Person #2 - I think Person #1 is the werewolf.
Person #3 - I think Person #2 is the werewolf.
Game host - Person #2 has the most votes and is therefore banished. I can now reveal that Person #2 was innocent.
Person #3 - Darn
Dr. Frankenstein: Werewolf?
Dr. Frankenstein: What?
Igor: There, wolf. There, castle.
Dr. Frankenstein: Why are you talking that way?
Igor: I thought you wanted to.
Dr. Frankenstein: No, I don't want to.
Igor: (shrugs) Suit yourself. I'm easy.
Regular Guy: Oh Sh!T! Full moon! -changes into a werewolf-
Werewolf: Wussup now b!tch?!
Danny: Barely, it was a huge blur and I cant even remember what happened when we got back. Why is there puke inside a box of cracklin oat bran!
Derek: We werewolfed it last night bro.