Werewolf is a game of accusations, lying, bluffing, second-guessing, assassination, and mob hysteria.
Based on the game Mafia (created in the spring of 1986 by Dmitry Davidoff at the Psychological Department of Moscow State University), Werewolf pits an informed minority of blood-thirsty shape-shifters against an uninformed majority of ordinary villagers.
There are many variants, but here’s a one page pdf guide to running a basic game:
And here are some useful links:
- Andrew Plotkin’s instructions for setting up and running the Seer variant of the game
- The wikipedia entry for Mafia
- The Graduate Mafia Brotherhood of Princeton