Three in a Row

How to play

You are X, the computer is O. Click any empty square on your turn. Get three of your marks in a line — horizontal, vertical or diagonal — to win. Choose Easy (random), Medium (blocks wins) or Unbeatable (full Minimax) from the menu.

Tips & strategy

Opening in a corner forces the AI into a single safe reply. The centre is the strongest cell. On Unbeatable the best you can do is draw — that is the mathematical truth of the game.

Good for

• Teaching children forks, blocks and draw-by-default logic.
• A fast 10-second game you can fit into anything.
• Measuring your brain against a provably perfect opponent.

Frequently asked questions

Can I beat the Unbeatable AI?

No. Noughts and crosses is a solved game — with perfect play both sides draw. The best you can do against Minimax is a tie.

Who moves first?

You (X) move first every round. Future updates may add "computer starts" mode.

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