If / ThenIf Then is a game of deduction and pattern recognition where you must work together to figure out the Challenge Code. One player is the knower, who reads the custom rule for the round, and tells the other players whether their guesses are right or wrong. Everyone else is a guesser; they take turns choosing a card from a display and placing it in the line as a guess. The guessers win if they successfully shed all of the cards from their hand before