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Code Breaker (Mastermind) is a code-breaking game of logic and deduction. One player creates a secret code using colored pegs, and the other player attempts to guess it within a limited number of tries, receiving feedback after each guess.

The codemaker secretly arranges 4 colored pegs from 6 available colors (duplicates allowed). The guesser has a decoding board with rows for guesses and small holes for feedback pegs.

1. 01The codemaker creates a secret 4-peg code using any combination of the 6 colors.
2. 02The guesser places 4 colored pegs as their first guess.
3. 03The codemaker provides feedback: a black peg for each correct color in the correct position, a white peg for each correct color in the wrong position.
4. 04Feedback pegs don't indicate which guess pegs earned them - just the totals.
5. 05The guesser uses the feedback to make a refined second guess.
6. 06Continue until the code is guessed exactly (4 black pegs) or guesses run out.
7. 07Standard limit is 10 or 12 guesses.

Codebreaker wins by matching the exact code within the guess limit. Codemaker wins if the guesser fails to crack the code.

Mastermind was invented in 1970 by Mordecai Meirowitz, based on an earlier pencil-and-paper game called Bulls and Cows. It has sold over 50 million copies worldwide.