How to Play:
The secret code is made up of four keys,each a different colour. Your quest is to break the the code by a series of guesses, checking the score after each guess.

Hint:  For simplicity, no colour is used more than once in the code. Remember that scores in two separate guesses may refer to different key colours in the hidden code!

Choose a code colour:


The accuracy of your guess is shown by the colours in the small boxes.

  shows a key choice which is a correct colour but in the wrong position

  shows a choice which is right key choice and in the right position

Invented by Mordecai Meirowitz in 1970-71,the puzzle appeared at the International Toy Fair in Nuremberg in February 1971. A toy manufacturer, Invicta, obtained marketing rights for the game, ‘Mastermind’ and the puzzle spread worldwide. Sadly, details of his original puzzle are lost!
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