Tic Tac Toe ↗
Plan ahead against a computer opponent that checks threats.
LOGIC · FREE TO PLAY
Code Breaker
Infer a three-digit code from exact-position and misplaced-digit clues.
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How to play Code Breaker
- The secret code uses three different digits from 1 to 6.
- Enter three distinct digits and check your guess.
- “Exact” means the right digit in the right position; “misplaced” means a correct digit elsewhere.
- Use the history to narrow possibilities within ten guesses.
A useful way to practice
Write down what is known and what is only assumed. Look for constraints that eliminate possibilities, then test a small next step. A wrong answer is useful information about the strategy you chose.
What your result means
This is a recreational logic activity. Results describe performance on this particular task, with this device and these rules. They are not a clinical assessment, IQ score or promise of improvements in daily life. Your best result and recent sessions stay in this browser; no account is required.
Is Code Breaker free?
Yes. You can play the full activity without a payment, download or account.
Can I use a keyboard?
Use Tab to focus buttons and Enter or Space to activate them. Answer fields accept normal typing. The maze also supports arrow keys. Timed tests will differ between touch, mouse and keyboard input.
Why did my result change?
Practice, a different generated puzzle, distractions and input timing all affect results. Compare several sessions rather than drawing a conclusion from one attempt.
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