Can I beat the Hard AI?

No — the Hard AI uses the minimax algorithm, which guarantees it never loses. The best outcome against Hard mode is a draw.

What is the minimax algorithm?

Minimax is a decision-making algorithm used in two-player games. It explores all possible future moves and picks the one that minimises the opponent's maximum gain, resulting in optimal play.

Does the score reset when I change difficulty?

The score resets only when you click 'Reset Score'. Changing difficulty keeps the current score but starts a new board.

You always play as X and go first. The CPU plays as O.

Games 免费无需注册

Tic-Tac-Toe Game

Play Tic-tac-toe against an unbeatable AI with three difficulty levels.

正在加载工具…

关于此工具

Challenge the CPU to a classic game of Tic-tac-toe right in your browser. Choose Easy mode for a casual opponent that makes random moves, Medium for a strategic challenger, or Hard for a perfect minimax AI that cannot be beaten. Winning squares are highlighted, scores are tracked across games, and a New Game button resets the board whenever you're ready for another round.

使用方法

1 Select a difficulty level: Easy, Medium, or Hard.
2 Click any empty square on the 3×3 grid to place your X.
3 The CPU automatically responds with its O move.
4 Continue until someone wins or the game is a draw.
5 Click 'New Game' to reset the board and play again.

关于此工具

使用方法

常见问题