For example, in the game Code 777, the question cards used to gather information are drawn at random.
[2] In fact, many of games in this category utilize a mechanic known as "The Missing Card," which was developed by Anthony E. Pratt for Cluedo (Clue in the United States).
By gathering information and using deduction and logic, the players can determine which cards were removed to win the game.
This game used punch cards and plastic lie-detector machine that players could use to determine if statements were true or false.
While popular, this game did not produce imitators akin to those from Cluedo or Scotland Yard.