Harman Play · Free browser game
Tic-Tac-Toe
Play classic tic-tac-toe against a smart computer opponent for free. Pick your marker, choose who starts, and test yourself against a causal or near-unbeatable minimax AI. X and O with your win streak tracked in your browser.
How to play
- Pick your marker — X or O — and choose whether you or the computer moves first.
- Tap any cell to place your mark; line up three in a row, column or diagonal to win.
- On Hard, the computer plays a perfect minimax strategy and never loses — on Casual it makes mistakes you can exploit.
Frequently asked questions
- Can I beat the tic-tac-toe AI?
- In Casual mode the computer plays deliberately imperfectly, so it is beatable. In Hard mode it uses a perfect minimax strategy and never loses — but you can still force a draw.
- Can I choose to be X or O?
- Yes — pick your marker (X or O) and decide whether you or the computer plays first before each round.
- Is tic-tac-toe free?
- Yes, free with no account, no ads and no downloads.
- How is the winner decided?
- Line up three X or O marks in a row, column or diagonal to win. A full board with no winner is a draw.