Mastermind

Crack a four-color code using exact and close-match clues.

Code room

Preparing the lock

Runs locally in this tab. No code or guesses leave your browser.

Rules and details

Mastermind was released as a code-breaking board game in 1970. Its compact feedback system turned logical deduction into a repeatable home game.

The code and guesses are generated and stored only in this tab.