Mastermind

From the book "100 Programs for the Commodore 64", MasterMind is a computer implementation of the board game of the same name by Ian McLean and John Gordon . The single player must crack a code of four digits and after each guess is given clues in the form of "amount of digits that are correct" and "amounts of digits that are correct but not in the right position". The goal is to guess the code in as little guesses as possible using logical deduction.