Tic Tac Toe — Online Multiplayer and Smart Bots

A free online tic-tac-toe game with three distinct computer opponents, local two-player mode on one device, and peer-to-peer online rooms joined by a six-character code. Each bot has its own thinking style: a careless Rookie, a Cautious blocker, and a Strategist that never loses.

1
Pick a mode

vs Computer, 2-Player on one device, or an Online room with a friend.

2
Choose difficulty or rules

For the computer mode, pick Rookie, Cautious or Strategist. Switch to Misère (3-in-a-row loses) or Ultimate (nine nested boards).

3
Share the link (online)

For an online game, copy the room link or show the QR so your friend can join.

4
Play, rematch, repeat

Tap cells to place your mark. After each game, one tap replays with roles alternated.

Classic paper-and-pencil game reborn in your browser with rooms, rematches, and a bot that never loses.

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Features

Three bots with different personalities
Rookie plays greedily without defending; Cautious follows rules with occasional blunders; Strategist runs full minimax with a randomized opening book.
2-player mode on one device
Pass the phone or laptop around the table. X and O switch automatically; no accounts.
Online rooms by shareable link
Create a room, send the URL or scan a QR; peer-to-peer connection between browsers, no server accounts.
Misère rule option
Flip the goal — three in a row LOSES. The bot adapts: minimax inverts, heuristics flip, completely different game.
Ultimate mode
Nine small tic-tac-toes inside one big board. The cell you take decides which small board your opponent plays next; win three small boards in a row to take the game.
Stats and win streaks
Wins, losses, draws and best streak per difficulty, saved in your browser.

Do the three bots really play differently?

Yes. Rookie is a weighted-random bot that never blocks; Cautious is a priority-rule engine with calibrated blunders; Strategist runs full alpha-beta minimax with a randomized opening book and a fork-preferring tiebreaker. Watch their first moves — they make completely different choices in the same position.

Can the Strategist be beaten?

No. Tic-tac-toe is a solved game. The best you can do against perfect play is draw. If you want wins, play Rookie or Cautious.

How does the online mode work?

Browsers connect peer-to-peer through PeerJS using our signaling server. Your moves travel directly between the two devices — there are no accounts, just a room code.

What is Misère?

A classic variant where the player who completes three in a row LOSES. The bot's minimax is inverted, so Strategist still plays optimally — for the opposite goal.

What is Ultimate mode?

A big board made of nine small tic-tac-toe boards. The cell you play in a small board sends your opponent to the matching small board. Win a small board to claim its spot on the big board; line up three claimed boards to win. The board you must play in is always highlighted.

Does it work on phones?

Yes. Touch controls, keyboard navigation, numpad 1–9 shortcuts, and screen-reader announcements are all supported.

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