Game of Rats

Rats - a game for a company of three or more people. Each player gets a card, which indicates either the Setting (the same location for everyone, which everyone knows except for the Rat), or that he is a Rat.

The Rat is one of the players. The players don't know which one is the Rat, and the Rat doesn't know the Setting. The goal of the Rat is not to reveal himself until the end of the game or determine the Setting in which everyone is.

In the same time, humans should decide which player is the Rat and expose it.