🧠Cerebite

Tic-Tac-Toe

Get three in a row — across, down or diagonally. You are X and move first.

Your turn (X)

How to play Tic-Tac-Toe

Players take turns marking X and O on a 3×3 grid. The first to line up three of their marks in a row — horizontally, vertically or diagonally — wins. If the grid fills with no line, it's a draw. On Hard the computer plays perfectly, so the best you can do is force a draw.

Frequently asked questions

Can you always win at Tic-Tac-Toe?
No. Against perfect play, Tic-Tac-Toe is a draw — neither player can force a win. You can only win if your opponent makes a mistake.
What is the best first move?
Taking a corner or the centre is strongest. A corner gives your opponent the most ways to slip up, while the centre touches four of the eight winning lines.
Is the Hard computer beatable?
No. On Hard the computer uses a perfect minimax strategy and never makes a mistake, so the best result you can get is a draw. Try Easy or Medium for a winnable game.