PAGE 1/6
CODEBREAKER
TURN 1 / 10
BEST —
READY — BUILD 4 COLOURS
PLAY
LEN4
MASTERMIND
SETTINGS
HOW
BLACK = RIGHT PLACE
WHITE = WRONG PLACE
KEYS
1-6 COLOURS • ENTER CHECK
BACKSPACE BACK • F FULL
ACTIONS
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SETTINGS
DIFFICULTY GUIDE
Easy: hidden code has no repeated colours.
Classic: repeated colours may appear.
Hard: duplicate colours with extra pressure.
TURN SETTINGS
Eight turns gives a quick challenge.
Ten turns is the balanced default game.
Twelve turns gives more beginner room.
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HOW TO PLAY MASTERMIND
1. Choose four colours to make a guess.
2. Press CHECK to receive feedback pegs.
3. Use feedback to crack the code.
FEEDBACK PEGS
Black peg: right colour in the right position.
White peg: right colour in the wrong position.
Empty peg: colour not found in the hidden code.
IMPORTANT NOTE
Feedback peg order does not point to exact slots.
Compare each row with earlier guesses.
Four black pegs wins immediately.
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STRATEGY TIPS
Start: test colour groups before exact order.
Compare: change one or two colours at a time.
Track: note colours that produce no pegs.
BEGINNER METHOD
Use Easy mode first to learn without duplicates.
Try two pairs of colours, then refine the order.
Use BACK if you tap the wrong colour.
DEVICE GUIDANCE
Page 1 keeps board and controls inside frame.
Fullscreen gives a larger board-only view.
Laptops can use number keys 1–6.
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COMMON SEARCHES
mastermind online • mastermind game
codebreaker game • crack the code game
logic deduction game • feedback peg game
SEARCH INTENT
Users want a fast puzzle that works instantly.
They expect colour guesses and clear feedback.
This page keeps board and controls visible.
USE CASES
Classroom deduction, solo logic or brain break.
Good for pattern reasoning and hypotheses.
Retro browser puzzle with no install needed.
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BEST URL
Recommended folder: mastermind-game
Canonical: https://teletext-tools.com/mastermind-game/
Title highlights Mastermind and codebreaker intent.