Play tic tac toe online for free, right in your browser. Take on the computer or pass the device to a friend for a two-player game. Get three of your marks in a row, across, down or diagonally, before your opponent does. The scoreboard keeps track of wins and ties between rounds.

Tic tac toe, also called noughts and crosses or Xs and Os, is one of the first strategy games most people learn. A round takes under a minute, which makes it perfect for a quick break, a classroom warm-up or teaching kids to think a move ahead.

This tic tac toe online game needs no download or sign-up and works on phones, tablets and computers.

Tic Tac Toe Rules

1. The game is played on a 3 × 3 grid of nine squares.
2. Player X always goes first, then players take turns.
3. On your turn, place your mark in any empty square.
4. The first player to get three marks in a row, column or diagonal wins.
5. If all nine squares fill up with no line of three, the game is a tie.

How to Play Tic Tac Toe Online

Step 1: Choose a Mode and Make Your First Move

Pick Play vs CPU to play against the computer, or 2 Players to play with someone next to you. You are X and move first. Tap a square; here X takes the top-left corner and the CPU answers in the centre.

Step 2: Block and Build Threats

Watch the turn indicator above the board. X takes the opposite corner. The CPU replies with a corner, which creates a diagonal threat that X must block. Always check for your opponent’s two-in-a-row before making your own plan.

Step 3: Win the Round and Track the Score

Blocking in the bottom-left corner gives X two ways to win at once, a fork. The CPU can only stop one, so X completes the left column and wins. The winning squares light up, the scoreboard adds a point, and Play Again or Restart Game starts a new round. Reset Scoreboard clears the totals.

Winning Strategy

• Start in a corner. It gives the most chances to set up a fork later.
• If your opponent starts in a corner, take the centre. It is the safest reply.
• Block first. If your opponent has two in a line, block it before anything else.
• Look for forks. A move that creates two threats at once usually wins.
• Opposite corners trick: as X, take a corner, then the opposite corner. If the CPU answers with another corner, you can often set up a fork.

How the CPU Plays

The computer follows simple rules: it takes a winning move if it has one, blocks your winning move, grabs the centre, then picks a corner or any free square. That makes it a fair opponent for kids and casual players, while experienced players can beat it with a fork. In two-player mode, the CPU is switched off and both moves come from the people at the screen.

Why Perfect Play Always Ties

Tic tac toe is a solved game. There are only 255,168 possible games, and computer analysis shows that if neither player makes a mistake, the result is always a draw. That is why the fun lies in spotting an opponent’s slip.

Ways to Use This Game

• A quick brain break between study sessions.
• Teaching children turn-taking, patterns and planning.
• A warm-up activity in class with a projector or smartboard.
• Settling small decisions with a friend in two-player mode.

More free games: try Daily Word Game for a word puzzle, or the Plank Timer for an active break.

Frequently Asked Questions