A simple game for a large group of people

werewolfThis looks like fun.

Werewolf is based on the game Mafia, which was created in 1986 by Dimitry Davidoff, a psychology student in the USSR. In 1997 Andrew Plotkin added the Werewolf theme and documented the rules. … [M]any players, including myself, consider it to be one of the most difficult and elegant games ever created.

http://maxistentialism.com/werewolf/