Tic-Tac-Toe Online
X vs O. You vs your friend. Live.
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About Tic-Tac-Toe Online
Tic-Tac-Toe Online turns the classic pen-and-paper duel into an instant live match. Create a room, share the 4-letter code or invite link, and the grid appears on both screens the moment your friend joins. Take turns placing X and O — every move shows up live — and chase the best-of-many bragging rights with the built-in session scoreboard. Marks swap every rematch so nobody keeps the first-move advantage, and emoji reactions let you talk trash without typing. It's free, needs no sign-up, and works between any two devices anywhere.
How to play Tic-Tac-Toe Online
- 1Enter a name and create a room — you'll get a 4-letter code.
- 2Send the code or the invite link to a friend.
- 3The match starts the moment they join; X moves first.
- 4Tap an empty square on your turn to place your mark.
- 5Line up three in a row to win; marks swap each rematch.
Tips & strategy
- Take the center when you move first — it joins the most lines.
- If your opponent has two in a row, block before anything else.
- Corners beat edges: they each touch three winning lines.
- Set up a double threat — two ways to win that can't both be blocked.
Frequently asked questions
How do I play Tic-Tac-Toe online with a friend?
Create a room to get a short code, share it (or the invite link) with your friend, and the live grid opens for both of you the moment they join.
Is it free?
Completely free — no account, subscription, or download. Rooms are created instantly in your browser.
Who goes first?
X always moves first, and the X/O marks swap between players every rematch so the advantage stays fair.