Sudoku and Mastermind are two of the puzzles people reach for most, so it's natural to wonder how alike they really are. The short answer: Mastermind is moderate to Sudoku. Below we lay out what the two share, where they part ways, and whether the skills you have built on Sudoku will carry over.
- Grid: rows of coloured code pegs
- Closeness to Sudoku: Moderate
- Also called: Bulls and Cows, Code-Breaker
What is Mastermind?
A code-breaking game: deduce a hidden sequence of coloured pegs from feedback that scores each guess for exact and near matches. Here are the rules in full:
- One player sets a hidden code of coloured pegs (classically four pegs from six colours); the other guesses it.
- Each guess earns feedback: a black key peg for every peg of the right colour in the right position, a white key peg for a right colour in the wrong position.
- The codebreaker uses that feedback to refine the next guess until the code is cracked.
What Mastermind looks like
One player hides a code of coloured pegs; the other guesses it. Each guess is scored: a black key peg for every peg of the right colour in the right position, a white one for a right colour in the wrong place. Below is a single guess row of four pegs.
A Mastermind board: each row is a guess of four coloured pegs, scored by small key pegs — black for a right colour in the right place, white for a right colour in the wrong place. Each score eliminates whole families of codes.
Of all the games here, Mastermind is Sudoku's nearest cousin in spirit: it is almost pure deduction toward a unique answer, needing no outside knowledge. The one real difference is hidden information — Mastermind makes you probe for the clues that Sudoku simply hands you from the start.
What Mastermind shares with Sudoku
- Mastermind is almost pure deduction — every feedback row eliminates codes, the way each Sudoku clue eliminates candidates.
- You reason from constraints toward a unique answer, never needing outside knowledge.
- Both reward keeping a tidy record of what is still possible.
How Mastermind differs from Sudoku
- The code is hidden, so early guesses are probes for information; Sudoku shows every clue from the start.
- You interact through rounds of feedback rather than reasoning over one static grid.
- There is a guessing element in the opening moves that Sudoku never has.
Do Sudoku skills transfer?
Mastermind trains the exact muscle behind a forcing chain: assume something, follow the consequences, and discard whole families of possibilities that contradict what you know — hypothesis-and-eliminate reasoning.
Brush up on the technique that carries over: Forcing Chains.
The verdict
Mastermind is Sudoku's deductive cousin wearing hidden information: both crack a unique answer by elimination, but Mastermind must first probe for the clues Sudoku hands you outright.