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Play Mastermind Online

Break a hidden four-peg Mastermind code using six colors and exact-position or color-only feedback, with eight attempts, three code styles including repeated colors, selectable peg slots, accessible color controls, win and loss states, and instant restart. Play free with no account or download.

Choose puzzle level

Single-player puzzle

No multiplayer mode

Your turnScore 0

How to play

Break a hidden four-peg Mastermind code using six colors and exact-position or color-only feedback, with eight attempts, three code styles including repeated colors, selectable peg slots, accessible color controls, win and loss states, and instant restart. Choose a puzzle level, make your move, and use Restart whenever you want a fresh game.

Strategy tips

  • Start with several different colors to gather broader feedback.
  • Exact feedback locks a color and position; color-only feedback keeps the color but moves it.
  • Repeated colors are possible on the medium and hard codes, so test duplicates deliberately.

FAQ

Is Mastermind free?

Yes. It is free to play in your browser.

Do I need an account?

No account or email is required.