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Mastermind

Logic

Crack the colour code in ten guesses.

Mastermind is a code-breaking game where one player (or the computer) sets a hidden sequence of coloured pegs, and the other tries to deduce it from limited guesses, receiving feedback after each. Commercialised in 1970 by Invicta Plastics, it remains a textbook example of constraint propagation.

Original ruleset

The classic

Classic 6-Colour

Hidden 4-peg code, 6 colours, 10 guesses. Black pegs for correct colour-and-position, white for correct colour-wrong-position.

Medium 5-15 min logic, deduction, code-breaking, classic

Modern variants

Reimagined

Word Mastermind

Same deduction engine, but the code is a 5-letter word. The Wordle-precursor that predates Wordle by 50 years.

Easy 3-10 min word, deduction, variant, wordle-like

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