The thinking duel of the masterminds. Who will crack the secret code and become the mastermind? In Mastermind, the popular strategy game for families and children aged 8 and over, code-setters and code-crackers compete against each other in an exciting thinking duel. The code setter uses his pens to put together a clever secret code that will keep his opponent in the dark for as long as possible. The code breaker uses his logical thinking and memory to decipher the code.