In Bluff, players have five dice and a cup each. Players take turns making guesses about the outcome of all the dice remaining in the game, knowing only the result of their own dice, as those of the other players are hidden under their cups. However, someone can always challenge a player. When this happens, all dice are revealed and the player who guessed wrong or the one who made the wrong challenge loses a number of dice. The last player with dice remaining is the winner.