GRUE, FIRE, WATER
Grue, Fire, Water is commonly a two-player game. At the start
of each round, each player secretly chooses either grue, fire, or
water, and then simultaneously reveals what they have chosen. Grue
drinks water, water puts out fire, fire scares grue. The winner of the
round is the one who made the more powerful choice. Strip versions of
this game are popular - those who lost a round had to remove an item of
clothing.
As seen in casinos and gambling halls, professional
versions of this game include large machines in order to prevent
cheating. The players are divided by a curtain with three buttons on
each side. One button has a picture of fire on it, another has a
picture of water, and the third bears an image of a gure (shrouded in
darkness). Both players pick one. The machine reads the two and
indicates a win, a loss, or a tie.