Nim Strategy ↗
Take one, two or three stones. The player taking the last wins.
LOGIC · FREE TO PLAY
Tic Tac Toe
Plan ahead against a computer opponent that checks threats.
Enable JavaScript to play. Instructions remain available below.
How to play Tic Tac Toe
- You play X and the computer plays O.
- Choose an empty square, then the computer responds.
- Three marks in a row, column or diagonal win.
- A full board without a winner is a draw. The computer searches possible continuations.
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 Tic Tac Toe 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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