About Tic Tac Toe

Tic Tac Toe is one of the most recognizable strategy games in the world. Two players alternate placing X and O marks on a 3x3 grid, trying to line up three of their symbols in a row, column, or diagonal. Despite its simplicity, the game teaches core concepts of game theory and strategic thinking. On PlayBrain, you can play against a configurable AI with Easy and Hard difficulty levels, or challenge a friend online by sharing a match link. The Hard AI uses optimal minimax strategy, meaning perfect play always results in a draw. Easy mode introduces random mistakes, giving newer players a fair chance at winning. The game runs instantly in any browser on desktop or mobile with zero setup required.

How to Play

1. Click or tap any empty cell on the 3x3 grid to place your mark (X or O).
2. Alternate turns with your opponent, aiming to get three marks in a row horizontally, vertically, or diagonally.
3. Block your opponent when they have two in a row, or they will win on their next move.
4. Control the center square for the strongest opening, then aim for corners to set up multiple winning threats.