Tic-Tac-Toe
Play Tic-Tac-Toe against the computer with an unbeatable Hard mode or a casual Easy mode. Classic Xs and Os in your browser.
Difficulty
Your move — you're X
Tap an empty square to place your X. The computer plays O. On Hard it uses an unbeatable minimax strategy — the best you can do is force a draw!
You
0
Draws
0
CPU
0
Tic-Tac-Toe is the timeless pen-and-paper game of Xs and Os on a 3x3 grid. You play as X against the computer, racing to line up three of your marks in a row. Choose Easy for a casual game or Hard for a computer that plays perfectly and can't be beaten.
How to use the Tic-Tac-Toe
- Pick a difficulty — Easy (random moves) or Hard (unbeatable).
- Tap any empty square to place your X.
- The computer responds with its O, and play alternates.
- Get three in a row — across, down, or diagonally — before the computer does.
Frequently asked questions
- Can you always win at Tic-Tac-Toe?
- No. With perfect play from both sides every game ends in a draw, which is why the Hard computer can't be beaten — the best you can force against it is a tie.
- What's the difference between Easy and Hard?
- Easy makes random legal moves so it's beatable for a quick win, while Hard uses the minimax algorithm to play optimally and will punish any mistake.
- Who goes first?
- You play as X and move first each round, which is the standard advantage in Tic-Tac-Toe. The computer plays O in response.
- How is the score tracked?
- A scoreboard counts your wins, draws, and the computer's wins for the session, so you can see how you're doing over multiple rounds.
