Tic Tac Toe

VS COMPUTER

Your move.

You play X.

Set up

Board

Level

Goal 3 in a row

Game guide · Board strategy

Tic Tac Toe, scaled up

This edition keeps the familiar alternating X and O turns, then expands the idea with four board sizes and matching win lengths. A quick 3 × 3 round teaches the rules; larger boards reward longer plans.

Tic Tac Toe board showing coral X marks and blue O marks in Leo Play Hub
The responsive game board with its clear move and win indicators.
Players
1 player vs AI
Session
1–5 minutes
Boards
3 × 3 through 9 × 9
Input
Touch or mouse

How a round works

Select an empty cell to place X. The computer answers with O. Complete the required number of marks in a horizontal, vertical or diagonal line before the AI does. A full board without a winning line ends in a draw.

Choose the challenge

Easy creates a relaxed first match, Medium blocks immediate threats more consistently, and Hard looks for stronger tactical replies. Larger boards also require longer lines, giving both players more room to create forks and disguised threats.

Useful tactics

On 3 × 3, control the center and watch for moves that create two winning lines at once. On larger grids, do not chase a single line too early. Build connected groups while checking every row, column and diagonal the opponent can extend.