Tic Tac Toe vs computer. Think beyond this square.

How to play Tic Tac Toe against the computer

1. Open computer mode. Play Against the Computer starts Vs computer directly.
2. Place your first X. Choose any empty square with a tap, click or keyboard action.
3. Wait for O. The computer places its piece automatically, then it is your turn again.
4. Complete or defend a line. Watch the rows, columns and both diagonals after every reply.

A saved computer board can resume in the same browser. Choose New round for a fresh position; you remain X and make the first move again.

Choose 9, 25 or 49 squares

Use the size selector above the board. Classic 3×3 needs three in a row, 5×5 needs four, and 7×7 needs five. All sizes support each playing mode. New rounds keep the current size. Once a friend has joined an online table, both players must agree to a size change; making a move cancels a pending request.

Play 25 squares ↗ · Play 49 squares ↗

What to expect from the computer

On the classic 3×3 board, Medium and Hard find a winning or drawing continuation. It does not need a long board or a complicated set of rules to make a careless move costly: an unblocked pair can finish the round.

With accurate play from both sides, classic Tic Tac Toe ends in a draw. Treat a draw as a useful result, especially while learning to defend forks. The aim of practice is to recognise a position earlier, rather than rely on the other side missing a threat.

Choose Easy, Medium or Hard. Easy is more forgiving. On the larger boards, Medium blocks immediate threats and Hard plans further ahead; both can be beaten. The same Tic Tac Toe rules apply to every round and every playing mode.

Three patterns to practise

Take a win that is already available

Before blocking or building another idea, check whether one empty square completes your own line. A winning move ends the round immediately.

Block the next opposing line

If O has two pieces on a line with an empty third square, that square matters now. Check the diagonals as well as straight rows and columns; a gap between pieces is still a threat.

Recognise a fork

A fork creates two different ways to win on the following turn. The centre and corners often take part in these patterns. Look at how a move changes more than one line, and review the position after a draw or loss.

Try the same ideas against a friend

When you want a different kind of challenge, Tic Tac Toe 2 Player lets two people take turns on one device. A human opponent also gives you a chance to talk through a fork or a missed block.

Use Tic Tac Toe with a friend for a private online invitation, or return to the Tic Tac Toe online overview to compare modes. Computer and shared-device progress use separate browser saves when storage is available.