Werewolf is a role-playing game for groups of people, each player is given the role of Villager, Werewolf or Seer, the aim of the game is to still be alive when the game ends.
There are day turns and night turns - During the day the villagers get to lynch someone they think is a werewolf, during the night, the werewolves kill a villager.
Whilst this seems simple, it is extremely compelling, as the werewolves are trying to get villagers to kill themselves by subversion.
There are also other player cards that can be introduced in larger groups - The Seer, The Lovers, The Little Girl and The Witch/Healer.
The larger the group the more fun can be had, so tell your friends and colleagues! The meet will be held in a pub, so it's a good excuse for going out for drinks too!